Niji, Solemn Overseer

Whenever a creature you control dies, if it
had first strike, put a first strike counter on Niji, Solemn Overseer. repeat this process
for flying, deathtouch, double strike, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance.
{w}{b}, Sacrifice a creature: Draw a card.
You gain 1 life.