Combat Celebrant, Displacer Kitten, Spellbinder, and Concordant Crossroads

Prerequisites

• Combat Celebrant on the battlefield
• Displacer Kitten on the battlefield
• Spellbinder on the battlefield
• Concordant Crossroads on the battlefield
• You have an instant card exiled by Spellbinder's imprint ability that has legal targets, if needed
• An opponent cannot block creatures you control
• Spellbinder attached to any creature except Combat Celebrant that does not have summoning sickness

Steps

1. Declare Combat Celebrant and the creature with Spellbinder attached as attackers, choosing to exert Combat Celebrant as it attacks
2. Combat Celebrant triggers, causing you to untap all other creatures you control and to get an additional combat phase after this one
3. Deal combat damage using the creature that has Spellbinder attached
4. Spellbinder triggers, causing you to copy a card exiled with it, and cast the copy without paying its mana cost
5. Displacer Kitten triggers, blinking Combat Celebrant
6. Resolve the spell cast in step 4
7. Repeat each combat phase

Results

• Infinite casts of cards exiled with Spellbinder
• Infinite combat damage
• Infinite combat phases
• Infinite ETB
• Infinite LTB
• Infinite magecraft triggers
• Infinite storm count