Unleash

Unleash is a keyword ability that was introduced in Return to Ravnica. The reminder text for Unleash reads "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.".

From the ()

Rulings

• 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.
• The unleash ability applies no matter where the creature is entering the battlefield from.
• 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.
• 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.

Color percentages

There is a total of 13 cards that involve unleash, which divide by color as such:

• Multicolored = 38 %
• Red = 31 %
• Black = 31 %