Cats you control have protection from Rats (A permanent or player with protection can't be targeted, enchanted, equipped, fortified, damaged or blocked by sources of the given property.).
At the beginning of your end step, target opponent creates a 1/1 black Rat creature token with deathtouch (Any amount of damage this deals to a creature is enough to destroy it.).
Whenever a Rat dies, put a +1/+1 counter on each Cat you control.
The information presented on this site about Magic: The Gathering, both literal and graphical, is copyrighted by Wizards of the Coast.
This website is not produced, endorsed, supported, or affiliated with Wizards of the Coast.