Pinnacle Starcage

If an artifact or creature has {X} in its mana cost, X is 0 for the purpose of determining its mana value.

Every token has mana value 0 unless it is copying something or was created with a specific mana cost.

In a multiplayer game, if Pinnacle Starcage’s owner leaves the game, the exiled cards will return to the battlefield. Because the one-shot effect that returns the cards isn’t an ability that goes on the stack, it won’t cease to exist along with the leaving player’s spells and abilities on the stack.