I want to make it a mono colored version of gifts. I am having troubles thinking which color it belongs too.
White is the color of exiling cards (Mostly attacking creatures, enchantments and some artifacts)
Swords to Plowshares and Path to Exile Celestial Purge, Death or Glory, Devouring Light, Dust to Dust, EraseExcise, Exile, Final Judgment, Ghostway, Flicker, Iona's Judgment, Last Breath, Liberate, Martyr's Cry, Momentary Blink, Morningtide, Otherworldly Journey, Reciprocate, Return to Dust, Scour, Second Thoughts, Soul Nova, Wipe Clean, Vengeful Dreams, Vanish into memory, Topple, Turn to Mist, Unified Strike, Unmake, Castigate
More interestingly, white has Pull From Eternity which grabs a card that is exiled.

Black has:
Yawgmoth's Will, Unmake, Leyline of the Void, Planar Void, Ashes to Ashes, Bitter Ordeal, Cranial Extraction, Castigate, Caustic Rain, Coffin Purge, Cremate, Death Wish, Decompose, Demonic Consultation, Dimir Machinations, Desperate Research, Doomsday, Ebony Charm, Eradicate, Extirpate, Fade Into Memory, Grave Consequences, Haunting Echoes, headstone, Mind Swords, Neverending Torment, Nighmare Incursion, Rats' Feast, Rapid Decay, Ravenous Trap, Sadistic Sacrament, Shadowfeed, Spoils of the Vault, Thought Hemorrhage, Tombfire.
Basically black has graveyard removal and extraction spells (Bitter Ordeal, Cranial Extraction, Dimir Machinations, Haunting Echoes, Sadistic Sacrament, Extirpate, Eradicate.
The card that looks most like this one is Desperate Research:

Flavor wise, I used the framework of Gifts Ungiven and Realms Uncharted for Prayers Unanswered. For Covetous Wish, I used the framework of the Judge Reward Cunning Wish:
