The Hive

Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)
As long as The Hive is on the battlefield, it has all abilities of all sliver cards in all exiles.
As The Hive enters the battlefield, exile all other permanents you control.
As The Hive leaves the battlefield, return the exiled cards to the battlefield under their owners' control.
The Hive's power is equal to the total power of sliver cards in all exiles and its toughness