Champion of the Depleted

When Champion of the Depleted enters the battlefield, Amass X and put X +1/+1 counters
on Champion of the Depleted.
Remove a +1/+1 counter from Champion of the Depleted: Return target creature from your
graveyard to your hand.
{b}{b}, {t}: Put a +1/+1 counter on Champion of
the Depleted.
"They'll just keep coming back. You slit one's throat,
then two seconds later it pops back up like nothing
happened."