Unusual creature board wipe

When this enchantment enters, destroy each permanent with the same name as another permanent, except for basic lands. They can't be regenerated. Whenever a permanent other than a basic land enters, destroy all other permanents with that name. They can't be regenerated.

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

You may have this creature enter as a copy of any creature on the battlefield.