Karmic Guide

Reanimation, but the spell is also a body that wants to die. The enters-the-battlefield trigger returns a creature card from the graveyard to the battlefield unconditionally, and white almost never gets to do that: the color's recursion usually demands a mana value cap, a creature type, or a smaller power. Here the cost is paid in fragility instead. Echo asks for a second time to keep the angel, a price no one intends to pay; the design assumes you will sacrifice it after the trigger resolves, or better, loop it. That sacrifice-as-feature framing is the whole engine. Pair a free reanimation target with a sacrifice outlet and the angel becomes a recursion shuttle: bring a creature back, return Karmic Guide itself to hand or play through something like Reveillark, fire the trigger again, and the loop never stops. The echo line, usually a tax on a creature's first turn, becomes a permission slip to throw the body away cheaply. Protection from black is the quiet load-bearing clause: it lets the angel ignore targeted black removal and survive black blockers, keeping the engine alive against the same color most likely to interact with a graveyard. A 2/2 with flying is incidental; what this card actually is, is a white reanimation spell that conveniently leaves a corpse behind.