Gisela, Blade of Goldnight

Undaunted (This spell costs 1 less to cast for each opponent.) Destroy all creatures.

Haste Myriad (Whenever this creature attacks, for each opponent other than defending player, you may create a token copy that's tapped and attacking that player or a planeswalker they control. Exile the tokens at end of combat.)

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