Vrael Butcher

Menace, Envenom (whenever this creature deals
damage to a creature, player, or planeswalker, put a
number of poison counters on that creature, player, or planeswalker equal to this creature's power.)
Vrael Butcher has first strike if blocking or being blocked by a creature with one or more poison counters on it.
Fun fact: the guards of Vrael hideouts often double as kitchen staff.