Fume Toxicologist

Deathtouch
Study - {2}{g}{g}, Exile a creature card from your graveyard. (For each creature card in your graveyard
that shares a creature type with the exiled card, put a
study counter on this.)
{2}{g}, Remove five study counters from Fume Toxicologist and sacrifice it: Put four -1/-1
counters on target creature.