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.
Repeat.
Results
Infinite combat damage.
Infinite combat phases.
Infinite magecraft triggers.
Infinite storm count.
Infinite mana lands you control can produce.
Infinite untap of lands you control.
Metadata
In 3 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).