Rat Swarm Summoner

When Rat Swarm Summoner enters the battlefield,
you may search your library for a card named Rat
Swarm Summoner, reveal it, and put it into your
hand. If you do, shuffle your library.
Other creatures you control named Rat Swarm
Summoner get +1/+1.
"One rat can be an annoyance, but
a swarm is unstoppable."