Legendary Creature - Rat Rogue
Rat creatures have fear. (They can't be blocked except by artifact creatures and/or black creatures.)
Tap, 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.
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Champions of Kamigawa