Sludgerbic, the Acidic Crest

Trample
Sludgerbic's power and toughness are equal to
the number of different creature types among
creatures in your graveyard.
Exile a creature card from your graveyard:
Sludgerbic gets +X/+X were X is double the
number of creature types on the exiled card.
Activate only once each turn.