A Siege’s controller can’t be its protector. If a Siege’s protector ever gains control of it, they choose a new player to be its protector. This is a state-based action.
Invasion of Ravnica // Guildpact Paragon
If a battle has no defense counters, and it isn’t the source of a triggered ability that has triggered but not yet left the stack, that battle is put into its owner’s graveyard. This is a state-based action. This doesn’t cause a Siege’s intrinsic triggered ability to trigger.
As a Siege enters the battlefield, its controller chooses an opponent to be its protector.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Leon Tukker
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
