Arawn's Spectral Hound

Arawn's Spectral Hound's power is equal to the number of card types among cards in your graveyard and its toughness is equal to that number plus 1.

Rebirth - {2}{b}, Exile any number of other cards from your graveyard with four or more card types among them. (You may cast this card from your graveyard for its rebirth cost.)