Unleash

Unleash is a keyword ability.

Details

Unleash was the guild mechanic for the Rakdos guild in the Return to Ravnica block, which went on a total of 13 cards.

When you play a creature with Unleash you may put a +1/+1 Counter on it and it can't block while it has a +1/+1 counter on it.

By putting the +1/+1 counter on the creature, you get an overstatted creature that can't block, and by not putting the +1/+1 counter on, you get an understatted creature that can block for you in a pinch.

It allows an aggro deck to block to prevent itself from being overwhelmed.

It should be noted that putting any +1/+1 counters on your Unleash creatures, will trigger the Unleash effect.

Comprehensive Rules

702.97. Unleash

• 702.97a Unleash is a keyword that represents two static abilities. “Unleash” means “You may have this permanent enter the battlefield with an additional +1/+1 counter on it” and “This permanent can’t block as long as it has a +1/+1 counter on it.”