Sartal the Fallen Life

Trample, Hexproof
{b}{g}{g}{t} Sacrifice another creature: Put X +1+1 counters on Sartal the Fallen Life, where X is
that creature's power. You lose life equal to half
of X, rounded down.
{g}{t} Return target creature card from your
graveyard to the battlefield. Remove X +1+1
counters from Surtal the Fallen Life, where X is
that creature's converted mana cost.