Rules glossary
310.12 Some battles have the subtype Siege. Sieges are subject to special rules.
- 310.12a As a Siege enters the battlefield, its controller must choose its protector from among their opponents. Only an opponent of a Siege’s controller can be its protector.
- 310.12b Sieges have the intrinsic ability “When the last defense counter is removed from this permanent, exile it, then you may cast it transformed without paying its mana cost.”