Demiplane

Convoke, Indestructible
When Demiplane enters the battlefield, send two target tapped creatures to a Demiplane outside of the current game. Counters remain. Creatures that die there are exiled. No spells or abilities can target creatures in the Demiplane, unless an ability is being triggered by a creature inside the Demiplane. When a creature attacks, it directly attacks another creature in the Demiplane, and
both fight simultaneously.