Riot

Riot is a keyword ability, which allows you to choose between gaining a +1/+1 counter or haste when a creature enters the battlefield. It was introduced in Ravnica Allegiance for the Gruul Clans of Ravnica.
==Rules==
==Rulings==
*Riot is a replacement effect. Players can't respond to your choice of +1/+1 counter or haste, and they can't take actions while the creature is on the battlefield without one or the other.
*If a creature entering the battlefield has riot but can't have a +1/+1 counter put onto it, it gains haste.
*If you choose for the creature to gain haste, it gains haste indefinitely. It won't lose it as the turn ends or as another player gains control of it.
*If a creature enters the battlefield with two instances of riot, you may choose to have it get two +1/+1 counters, one +1/+1 counter and haste, or two instances of haste. Multiple instances of haste on the same creature are redundant, but it allows Gruul to send a strong message to its opponents.
==Examples==
==Cards that grant riot==
*<c>Domri, Chaos Bringer</c> 
*<c>Rhythm of the Wild</c> 
*<c>Uncivil Unrest</c> 
==References==