Consider (don't have):
** Lae'zel's Acrobatics
$$ Displacer Kitten
Malanthrope - Bojuka Bog on a flier that grows
* $ Titan of Industry - Removal, protection, life gain and a win con
* Teleportation Circle - Another Conjurer's Closet
Glorious Protector - Basically a Ghostway in response to a sweeper, or can be used to just save one thing from spot removal
$$$ Ghostway
$$$$ Finale of Devastation - Can let me win with my dorky creatures when I have infinite mana
Quandrix Cultivator - Ramps untapped
Amphin Mutineer - Removal, but the 4/3 it gives is actually kind of big
$ Cosmic Intervention - Ghostway-esque
Illustionist's Stratagem - Double-blinker that cantrips, but the 4 mana is a bit steep
Ranar the Ever-Watchful - Get a spirit for each blink
$$ Druid of Purification - Lots of artifact/enchantment removal
$$$$ Great Whale - Another infinite mana generator
Murkfiend Liege - Bigger dudes and untap Roon for more blinks
$ Quest for Renewal
White Plume Adventurer
Patriar's Seal - Mana rock that can untap Roon

Consider:
** Teferi's Protection
* Prosperous Innkeeper - Gets me a treasure every time it's blinked, and life every time something else enters
Krosan Verge - Ramp and fixing in a land slot (replace a plains?)
36th land: Misty Rainforest
Bramble Sovereign - Copy my things, or curry favor by giving someone else a copy of their thing
Watcher for Tomorrow - Card selection
Blue Sun's Zenith - A wincon for when I go infinite, or just a way to sink large amounts of mana to dig
Voidmage Husher - Stifle on a stick, to let me keep things like commanders permanently exiled (or at least one)
Yavimaya Dryad - 3 CMC ramp, but costs GG and can only fetch Forest
Rishkar - Make a lot of dorks
Thousand-Year Elixir - Hasty Roon activations, and double blinks
* Signets, Talismans, Thought Vessel, Fellwar Stone, Arcane Signet - 2-mana ramp
Kodama's Reach - Ramp, but not blink-based
** Eladamri's Call - Get a creature with whatever effect I need at the moment
** Semester's End - Blink my entire board and make it a little bit better. Can be used as sweeper protection
* Elvish Visionary - 1/1 cantrip
* Risen Reef
** Hornet Queen - It's quite high costed, but can quickly generate an enormous board
Timeless Witness - Eternal Witness that can be eternalized
Flickerwisp
Counterspell, Dovin's Veto, Negate - Cheap counters
Beast Within - Another out to Torpor Orb effects
* Altar of the Brood - Mill out everyone with infinite blinks
Staff of Domination - Untap Roon, and mana sink for infinite mana
Suture Priest + sac outlet - Get infinite life with Karmic Guide+Reveillark combo
Walking Ballista - Wincon when I have infinite mana
Mnemonic Wall - More ways to go infinite
Retribution of the Meek - Since so many of my guys are small, this can be pretty one-sided
Lonis, Cryptozoologist - More value
Bane of Progress - Repeatable ench/arti sweeper
Rishkar - Make dudes into dorks
Growing Rites - I have so many creatures this should be relatively easy to flip
Fiend Hunter - Perma-exile with a blink in response to ETB trigger
Kogla, the Titan Ape - Removal
Flicker of Fate
Time Wipe, Cleansing Nova
Luminous Broodmoth - Boardwipe protection
Teferi's Time Twist, Turn to Mist - Slow blinks to save something from a sweeper
Pondering Mage
Whitemane Lion - Draw a card every turn with Ephara or save an important creature
Elite Guardmage - Lifegain and card draw
* Meteor Golem - It's nice to be able to kill anything dangerous, but this quickly gets very un-fun to play against if you can blink it multiple times per turn. Currently lacking in creature removal, though
Woodfall Primus
Caller of the Claw
Greenwarden of Murasa
Prime Speaker Zegana - I don't have a lot of big dudes, but I do have a lot of cantrips, so this might not be worth the 6 mana with heavy color requirements
Hero of Goma Fada - Blink in response to a sweeper
Unbreakable Formation, Make a Stand, Rootborn Defenses - Sweeper protection
Join Shields - Sweeper protection or surprise blockers
Gideon's Phalanx - Sweeper protection, but expensive and somewhat unreliable
Krosan Grip, Forsake the Worldly - Removal that don't leave me just dead to a Torpor Orb
Bant Charm - Versatile spell that I won't have a lot of decks for
Harmonic Sliver
Luminate Primordial - Strong creature removal, although quite expensive
Vigean Graftmage(*), Vizier of Tumbling Sands(*), Freed from the Real, Magewright's Stone, Galvanic Alchemist, Second Wind, Seeker of Skybreak, Aphetto Alchemist, Unbender Tine, Jandor's Saddlebags, Scryb Ranger, Quirion Ranger, High Alert, Tidewater Minion - Untap Roon
Dream's Grip, Emerald Charm, Refocus, Burst of Energy, Gift of Growth, Gerrard's Command, Ornamental Courage, Prepare // Fight - Untap Roon once
Training Grounds - Discount Roon's activation and some other ones
Talisman of Progress/Unity - Cheap ramp that can produce colorless for Displacer
Quirion Trailblazer - Ramp a land, but costs 4 mana
Yavimaya Granger - Ramp a land, then blink it before echo. Can stop paying echo when we feel like we have enough, and can even be returned with Reveillark
Fertilid - (Political) Source of ramp that gets reset with blink, but it costs 2 mana each time before needing to be reset, so probably not worth it
Trostani's Summoner, Conclave Naturalists - I have full art promos, and I'm not going to play these in other decks
Monk Realist
Knight-Captain of Eos, Captain of the Watch, Geist-Honored Monk, Linvala, the Preserver - Token value
Angel of Sanctions
Clever Impersonator
Slithermuse, Riverwise Augur - Card draw
Loaming Shaman, Angel of Finality - Graveyard hate

Consider - Brago's legacy:
Whirler Rogue - I don't have any specific creatures that need to connect in this deck (besides Brago himself), so it's probably not worth the include
Lavinia of the Tenth - Great for locking down mana rocks and tokens, but it does nothing against the big beaters, and is probably not worth it when I can't necessarily blink it every turn. It can lock down a Disk, O-Stone or similar, though

Consider (lands):
Seaside Citadel
Skyshroud Forest - Tapped pain land, good for Eldrazi Displacer

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Considered cuts:
Sun Titan - A lot of my stuff can't be returned by this
Coiling Oracle - Difficult mana cost to cast on turn 2, and not impressive late game (never really want to blink this with Roon)
Wall of Omens - Only draws a single card, but has a big butt early
Sunblast Angel - I have so many creatures that this is a bit risky
Scholar of the Ages - 7 mana is a lot, but this can be blinked using a "one-shot" blinker to get back something else without losing that card
Strionic Resonator - Goes infinite with Brago and Sol Ring/Peregrine Drake, but other triggers might not be worth the mana to copy
? Venser, Shaper Savant - Remand or permanent-removal, "wins" the game with infinite mana (Displacer + Drake) and infinite blinks (Archaeomancer/Scholar + Ghostly/Displace)
? Cultivate - Ramp, but not blink-based
? Mystic Snake - It works with the flicker instants, but not with Roon
Llanowar Visionary
Perplexing Chimera

Considered cuts (lands):
Evolving Wilds - Can get Wastes or fix my mana if I am missing a color, but the ETBT aspect is meh
Ghost Quarter - Tapping for colorless for Eldrazi Displacer is nice, but could be a liability otherwise. Maybe Acidic Slime/Terastodon are enough for land destruction?
Alchemist's Refuge
Wastes

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Cuts:
Fierce Empath - Cutting down on the mana curve makes this much worse
Call for Unity - Can make any of my creatures into a lethal threat, but costs 5 mana to get started and can only grow once per turn
Kiora, Behemoth Beckoner - Untaps with some card draw
Djeru's Resolve - Untap Roon or protect something from damage
Knight of the White Orchid, Kor Cartographer - Better used in a non-green deck, although it's nice that they can fix mana by getting duals
Elvish Rejuvenator - Not guaranteed to hit anything
Stalking Leonin - Decent as a rattlesnake, but doesn't stop wide attacks at all, and we don't want to waste a blink on this
Wild Wanderer, Ondu Giant - Too expensive for one basic land? Giant can be returned by Reveillark, which is nice
? Crab Umbra - 3 mana is way too much for an untap, and with the amount of ramp I have, recasting Roon if they want to use spot removal on him is probably not a huge deal
? Pemmin's Aura - Do I really need to set myself up for a 2-for-1 with this only to be able to use Roon twice in a turn? Since Roon slow-blinks, I can't go infinite with this
Felidar Guardian - I don't have planeswalkers to reset
Nevermaker - Never does anything until it is blinked out
? Azor, the Lawbringer - 6 mana is a lot, and I probably won't want to spend 4+ mana to Sphinx's Rev during my combat. Being able to blink him to stop someone from going off during their turn is probably the most important aspect, but I have to do it before their turn, so this is really only great as a lock piece when I blink it every turn
Venser, the Sojourner - The ultimate is amazing, but flickering one thing per turn and having to protect it for a bunch of turns is not a great proposition
Angel of Condemnation - Another Roon with an O-ring/Angel of Serenity option on exert. However, the abilities are quite expensive
? Angel of Serenity - Costs a lot of mana, and will usually only be used to return stuff from my graveyard to my hand (to then spend even more mana on redeploying). However, the O-Ring mode might make it worth it
? Lumbering Battlement - Can be used as a way to blink multiple things for a bigger payoff, but I lose the option of granularity and this effect might not be worth 5 mana. It also doesn't have evasion to make use of the big stats
? Illusionist's Bracers - Only targets are Roon, Displacer, Witch and Kiora's Follower, so this is basically a blink doubler. Is that worth the slot and mana?
Sea Gate Oracle - Slightly better than Wall of Omens for draw, but also 50 % more expensive. I don't really need the selection enough to warrant the cost increase
Blighted Woodland - I will probably have enough ramp from my dudes that I don't need to sink 5 mana into this colorless land
Cloudcrest Lake - Can only be used for colored mana every 2 turns
Cloudshift - I had too many blink instants and this is the worst one
? Leyline of Anticipation - Do I really need flash?
Solemn Simulacrum - More needed in non-green decks
Sword of Hearth and Home - Blinks and ramps, but maybe I have enough of that that I don't want to cut a creature for it?
Reveillark - Doesn't do anything until it leaves, and can't combo with Karmic Guide without a sac outlet or unless I'm already going infinite with blinks
Skyclave Apparition - Needed in Hofri, and avoiding the WW is nice