Creature — Rat 2/2, 1BB (3)
Uncommon
Relentless Rats gets +1/+1 for each other creature on the battlefield named Relentless Rats.
A deck can have any number of cards named Relentless Rats.
Illus. Thomas M. Baxa

12/1/2004: Yes, you're allowed to have a deck consisting of sixty Relentless Rats and nothing else.
12/1/2004: Relentless Rats's last ability overrides the normal limit of four of an individual card in a Constructed deck.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Extended (Type 1.X)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern