swarmed with memnite and infinite damage before attack (or with if you choose)

Whenever a creature enters, that creature's controller may have it deal damage equal to its power to any target of their choice.

Creatures don't untap during their controllers' untap steps. Whenever a creature enters, untap all creatures.

Enchant creature Enchanted creature has ": Create a token that's a copy of this creature, except it has haste. Exile that token at the beginning of the next end step."

Flying