First D-sphere combo

Exile each creature you control. Return those cards to the battlefield under their owner's control at the beginning of the next end step.

Each land is a Swamp in addition to its other land types.

All Swamps are 1/1 black creatures that are still lands.

Each other creature becomes a copy of target nonlegendary creature until end of turn.

When this enchantment enters, you may exile target nonland permanent not named Detention Sphere and all other permanents with the same name as that permanent. When this enchantment leaves the battlefield, return the exiled cards to the battlefield under their owner's control.