Skreev, Shadow Beneath

+1: Create a 1/1 black Rat creature token with "This creature can't block." Then, if you control five or more Rats, draw a card and lose 1 life.
-2: Target player discards a card. If they can't, you may return a Rat card from your graveyard to the battlefield tapped.
-6: You get an emblem with: "At the beginning of your end step, create X 1/1 black Rat creature tokens, where X is the number of Rats you control"