Brunhild, the Raven Queen

Flying, deathtouch
Whenever a creature with power 3 or less attacks
you or a planeswalker you control, that creature's
controller loses 1 life and you gain 1 life.
At the beginning of the end step, if you gained 5
or more life this turn, create three 2/2 black
Raven creature tokens with flying and menace.