Zarak, Venomous Tyrant

Trample, deathtouch
Whenever a creature that was dealt damage by
Zarak, Venomous Tyrant this turn dies, that
creature's controller gets a venom counter.
Whenever another creature you control with deathtouch attacks, it gets +X/+X until end of
turn, where X is the number of venom counters
the defending player has.