King of the Rats

Deathtouch, double strike
Whenever King of the Rats attacks, search your library for a Rat card with converted mana cost 3 or less. reveal it, and put it into your hand. Then, you may reveal any number of Rat cards from your hand, create that many 1/1 Rat tokens with "This creature can't be blocked by creatures with greater power". Those tokens are tapped and attacking.