Ovtu the Soul Bound

Flying, hexproof, haste, menace, first strike
When Ovtu SB enters the battlefield, add X
+1/+1 counters for every creature and
enchantment in the graveyard.
At each players end step, add+1/+1 counters to
Ovtu SB equal to the number of creatures and
enchantmants going to the graveyard this turn.
{x}{t} : Remove X +1/+1 counters and give a
creature or enchantment indestructible
until end of turn.