Once upon a Deadly Dance

Read Ahead
I-Deal 3 damage to each player.
II-Exile the top three cards of your library. For
each Mountain card exiled this way, Once upon
a Deadly Dance deals 1 damage to each opponent.
You may play those cards this turn.
III-After your postcombat main phase this turn,
untap target creature. After that phase, you gain
an additional combat phase, followed by an
additional main phase.
Evoke—Exile a red card from your hand.