true king of rats

+1: Create a 1/1 black Rat creature token:
-2: Sacrifice any number of Rats you control. For each Rat sacrificed this way, target opponent loses 2 life, and you gain 2 life
-7: You get an emblem with "At the beginning of your upkeep, create X 1/1 black Rat creature tokens, where X is the number of Rats you control