Dethrone

Dethrone is a keyword found in the multiplayer Conspiracy set. Dethrone triggers whenever a creature with dethrone attacks the player with the most life or tied for the most life. When the ability resolves, you put a +1/+1 counter on the creature.

Rulings

 * Dethrone doesn’t trigger if the creature attacks a planeswalker, even if its controller has the most life.
 * Once dethrone triggers, it doesn’t matter what happens to the players’ life totals before the ability resolves. You’ll put a +1/+1 counter on the creature even if the defending player doesn’t have the most life as the ability resolves.
 * The +1/+1 counter is put on the creature before blockers are declared.
 * In a Two-Headed Giant game, dethrone will trigger if the creature attacks the team with the most life or tied for the most life.