Derfnir Fervorblade

As long as you control another multicolored permanent, Derfnir Fervorblade gets +1/+1 and has "Whenever Derfnir Fervorblade blocks or becomes blocked by a creature, Derfnir Fervorblade deals 1 damage to target creature or player."
The rogues of Defnir fight for plunder alone, ravaging Xalys's shipping lanes and leaving buildings ablaze in the night.