Krebrithan, the Green

Trample, Deathtouch, First Strike, Fear
Whenever a source deals damage to Krebrithan, the
Green, that sources controller gets a poison counter.
Whenever Krebrithan, the Green becomes blocked
by a creature, that creatures controller loses 2 life
and you gain 2 life.
Whenever Krebrithan, the Green attacks and isnt blocked, defending player loses 1 life for each card
in their graveyard.