Deathtouch

When Swarm of Giant Rats enters the Battlefield, create three 1/1 black Rat creature tokens. If it enters using Madness, put a counter +1/+1 on each other Rat creatures you control.

Other Rat creatures you control have deathtouch.

Madness {2}{B}{R} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)