The Devourer

The Devourer gets +1/+1 for each creature card
in your graveyard.
Once every turn you may exile three creature
cards from your graveyard, if you do, choose one —
• The Devourer gains all keywords of creature
cards in your graveyard.
• The Devourer becomes a copy of target creature
in your graveyard, it has this ability.
• The Devourer gains all activated abilities of creatures in your graveyard.