When this creature enters, it deals X damage to target creature or planeswalker an opponent controls, where X is the number of creature cards in your graveyard.
You know you've ventured too deep when the rats stop running and hold their ground.
This creature can't block. When this creature dies, create X 1/1 black Rat creature tokens with "This token can't block," where X is the amount of damage dealt to it this turn.
Clawing for scraps and driven mad by hunger, the individual rats became a writhing mass.
When this creature enters, create a 1/1 black Rat creature token with "This token can't block." Whenever another creature you control dies, put a +1/+1 counter on this creature.
Lord Skitter promised the starving rats of Edgewall that they would never go hungry again.