Grim Roustabout {1}{B}

Creature — Skeleton Warrior

Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can’t block as long as it has a +1/+1 counter on it.)

{1}{B}: Regenerate Grim Roustabout.

He’ll point you to your death row seats.

1/1

Watermark: Rakdos

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Prints	USD	EUR	TIX
Return to Ravnica	$0.05	€0.12	0.03

You make the choice to have the creature with unleash enter the battlefield with a +1/+1 counter or not as it’s entering the battlefield. At that point, it’s too late for a player to respond to the creature spell by trying to counter it, for example. (2013-04-15)
The unleash ability applies no matter where the creature is entering the battlefield from. (2013-04-15)

A creature with unleash can’t block if it has any +1/+1 counter on it, not just one put on it by the unleash ability. (2013-04-15)
Putting a +1/+1 counter on a creature with unleash that’s already blocking won’t remove it from combat. It will continue to block. (2013-04-15)