Sidharth, the Returned

Sidharth enters the battlefield with a +1 +1
counter on it for each creature in your graveyard.
Whenever a creature you control would
enter your graveyard, put a +1 +1 counter
on every other creature and a +1 +1 counter on
Sidharth for each creature in your graveyard.
{u/b}{t}: Sacrifice a creature. You gain life equal to
it's mana value.
Partner