Need:
Regal Bloodlord
Resplendent Angel

Semi-pricey (probable) additions:
Crested Sunmare
Polluted Bonds
Painful Quandary
Norn's Annex
Phyrexian Arena
Rhox Faithmender
Grand Abolisher
Serra Ascendant
Return to Dust

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Consider:
High priority:
Windborn Muse
Athreos

Misc (card draw, multi-purpose):
Regna, the Redeemer + Krav, the Unredeemed: They only really make sense as a pair in this deck
Profane Procession
Pillory of the Sleepless
One Thousand Lashes
Eternal Dragon
Vedalken Orrery
Fellwar Stone
Magus of the Coffers
Phyrexian Rager
Promise of Power
Increasing Ambition
Whip of Erebos
Bloodgift Demon

Drain:
Kokusho
Scholar of Athreos
Souls of the Faultless
Zulaport Cutthroat (only triggers of own creatures)
Tithe Drinker, Kingpin's Pet, Thrull Parasite - Cheap extortionists

Pain:
Athreos
Ob Nixilis, Unshackled
Fate Unraveler
Cryptolith Fragment

Gain:
Beacon of Immortality
Venser's Journal
Soul Warden/Soul's Attendant
Soldier of the Pantheon
Elixir of Immortality
Sangromancer
Ashes of the Abhorrent
Eternity Vessel

Utilizing the life:
Vona, Butcher of Magan
Phyrexian Reclamation
Ayli
Serra Avatar
Cradle of Vitality

Stalling/Taxes/Protection:
Windborn Muse
Vampire Nighthawk
Solemnity
Angel of the Dire Hour
Tocatli Honor Guard
Overwhelming Splendor
Imposing Sovereign
Kinjalli's Sunwing
Rout
End Hostilities
Final Judgment
Descend Upon the Sinful
Sphere of Safety
Unmake
Damnation
Toxic Deluge

Recursion:
Phyrexian Reclamation
Athreos
Emeria Shepherd
Sun Titan

Taxes:
Thalia, Guardian of Thraben
Aura of Silence
Spelltithe Enforcer

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Consider (don't have):
Shattered Angel

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Considered cuts:
Deadly Tempest - Expensive for a wrath with a relatively minor upside
Akroma's Memorial - Expensive with relatively low flexibility
Hedron Archive - I need lots of colors
Underworld Connections - Pretty slow with a limit of one card per turn, and mana intensive with requiring a land
Ajani's Pridemate - Probably not effective enough
Hour of Revelation - I probably have non-creature, non-land permanents that I don't want to kill
Arguel's Blood Fast - Quite expensive to use
Bontu's Monument - Depends on the amount of black creatures
Agent of Masks - Too much mana for this effect?
Treasury Thrull - Too much mana?
Divinity of Pride - Can be hard to cast, but definitely worth it with Gary
Pontiff of Blight - Do I have enough creatures for this to be effective?
Urborg

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Cuts:
Death Grasp – Too mana inefficient. Replaced with Torment of Hailfire as a better finisher/mana sink
Teysa, Envoy of Ghosts – Too expensive for what it offers, probably
Lightning Greaves
Burnished Hart - Upgraded to Gilded Lotus
Sorin Markov - Feelbad
Decree of Pain - Too much mana to cast? Also struggling with card draw though. Replace with card draw
High Priest of Penance - Rattlesnake, but not really on theme
Ob Nixilis of the Black Oath - Hard to protect, and very ineffectual if I don't get the emblem
Elspeth, Sun's Champion - Not on theme with the deck, and if she's just going to be a board wipe, there are better options
Urborg - Can't find my second copy