Spellbinder and Aggravated Assault on the battlefield.
Spellbinder attached to a creature that cannot be blocked and killed by an opponent.
The creature with Spellbinder attached can attack this turn.
Lands you control can tap to produce at least ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Steps
Deal combat damage with the creature that has Spellbinder attached.
Spellbinder triggers, casting a copy of Turnabout without paying its mana cost.
Resolve Turnabout, untapping all tapped lands you control.
Move to your postcombat main phase.
Activate all mana-producing lands you control by tapping them, adding at least ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Activate Aggravated Assault by paying ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) , untapping all creatures you control and causing you to get an addtional combat phase and main phase after this one.