Captain America 1st Avenger

Flying
Other Avengers, Fantastic 4, and X-Men
you control get +1/+1 and have lifelink.
At the beginning of each end step, if a creature
card was put into your graveyard from anywhere
this turn, create a 1/1 white Agent creature token
with "When this creature dies, it gives a +1/+1
counter to any target."
"I can do this all day"