Invasion of Tarkir // Defiant Thundermaw
Battle — Siege // Creature — Dragon
Rulings (18)
In a multiplayer game, if the protector of a battle leaves the game and that battle is not currently being attacked, its controller chooses a new protector for it as a state-based action. If it is being attacked, its controller chooses a new protector for it once no creatures are attacking it. This means that it continues to be attacked and can be dealt combat damage as normal.
Sieges each have an intrinsic triggered ability. That ability is “When the last defense counter is removed from this permanent, exile it, then you may cast it transformed without paying its mana cost.”
A battle can be attacked by all players other than its protector. Notably, this means a Siege’s controller can attack it.
Legality
Formats by platform