Legendary Creature — Rat Rogue 2/3, 3BB (5)
Rare
Rat creatures have fear. (They can't be blocked except by artifact creatures and/or black creatures.)
{T}, Sacrifice a Rat: Put X 1/1 black Rat creature tokens onto the battlefield, where X is the number of Rats you control.
Marrow-Gnawer united three nezumi gangs when he slew their leaders in a single night. Now they call him their first lord.
Illus. Wayne Reynolds

12/1/2004: Marrow-Gnawer's ability counts the number of Rats on the battlefield when it resolves, so you don't count the sacrificed Rat.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern