Viconia, Disciple of Blood

Legendary Creature — Elf Cleric3/4

When this creature specializes, conjure a duplicate of target creature card exiled with this creature into your hand. The duplicate perpetually gains prismatic and "When this creature enters, each opponent loses 2 life and you gain 2 life." {1}: Exile target card from a graveyard.

Not legal in Commander

View Viconia, Disciple of Blood on Scryfall