Salethar, Vrael Revolutionary

Whenever a creature an opponent controls is
sent to a graveyard from the battlefield, create a
1/1 black/green Mutant token with Envenom.
{b/g}{b/g}, {t}: Remove all poison counters from target creature, planeswalker, or player, then deal
damage to the target equal to the number of
counters removed.
Envenom