MTR 4.8 Reversing Decisions

Players are expected to consider their options before taking an action and players are not usually allowed to take back an action that has been communicated to their opponent, either verbally or physically.

Sometimes, a player will realize that they have made a wrong decision after making a play. If that player has not gained any information since taking the action and they wish to make a different decision, a judge may allow that player to change their mind.

Judges must carefully consider whether the player has gained information since making the play that might have affected the decision;

in particular, players may not try to use opponent reactions (or lack thereof) to see if they should modify actions they committed to.

If the judge cannot be sure no information was gained, they should not allow the decision to be changed.

Teammates intervening before information has been gained is acceptable when considering a backup.


  • A player plays an Island and, before anything else happens, says “Sorry, I meant to play a Swamp.”
  • 2. A player says “No blocks” immediately followed by “Wait, no, I block with this creature.”
  • A player says “Go. Wait, land, go.”