Swarm Of Rats

A deck can have any number of cards named
Swarm Of Rats in it.
Swarm Of Rats has power and toughness equal to
the number of Rats you control.
At the beginning of your upkeep, if you control
no other Rats, you may search your library for a
card named Swarm Of Rats and put it into your
hand. If you do, shuffle your library.