Spellbinder, and Savage Beating

Prerequisites

• Spellbinder on the battlefield
• Savage Beating in exile
• Spellbinder attached to a creature that can attack this turn and that cannot be blocked by an opponent

Steps

1. Declare the creature with Spellbinder equipped as an attacker, attacking an opponent unable to block it
2. Deal combat damage with the creature, triggering Spellbinder, casting a copy of Savage Beating without paying its mana cost
3. Resolve Savage Beating, untapping all creatures you control and getting an additional combat phase after this one
4. Repeat

Results

• Infinite combat phases
• Infinite damage
• Infinite magecraft triggers
• Infinite storm count