Dirty Wererat

Schmutzige Werratte (Dirty Wererat) (de)

Creature - Human Rat Minion | Power/Toughness: 2 / 3 (CMC 4)
, Discard a card: Regenerate Dirty Wererat.
Threshold -- As long as seven or more cards are in your graveyard, Dirty Wererat gets +2/+2 and can't block.