The Raven Man

Whenever a raven or bird you control blocks an opposing creature, that creature's controller loses
1 life and you gain 1 life.
+1: you may sacrifice a creature or a planeswalker.
If you do, create two blue and black 1/2 raven
token creatures with flying.
-3: gain control of target creature or planeswalker,
it has "at the beginning of your endstep, ~'s owner
gains control of ~ unless you tap two untapped
ravens you control."