Ithis, Titan of Life's Reserve

When Ithis enters the battlefield, sacrifice it unless
it escaped.
Whenever Ithis enters the battlefield or attacks,
put two +1/+1 counters on target creature you
control then you gain life equal to the greatest
power among creatures you control.
Escape — {g}{g}{w}{w},Exile five other cards from
your graveyard. (You may cast this card from your
graveyard for its escape cost.)