Yula, Nightmare Shepherd

+1: Create two 1/1 black Nightmare creature tokens with "When this creature dies, target creature gets -1/-1 until end of turn."
-3: Until your next turn, target black creature you control gets +2/+1, gains deathtouch and has "When this creature dies, you gain 2 life."
: Yula, Nightmare Shepherd can be your commander.