Tetsuo, Imperial Champion + Savage Beating + Mystic Retrieval + Swarm Intelligence + Relearn

Prerequisites

• Tetsuo has an Equipment attached to it with mana value 5 or greater.
• Tetsuo does not have summoning sickness and cannot be blocked and killed by an opponent.
• One of Mystic Retrieval or Relearn must be in your hand, with the other in your graveyard.

Steps

1. 1Declare Tetsuo as an attacker. Tetsuo triggers, causing you to cast Savage Beating without paying its mana cost, choosing its second mode.
2. 2Swarm Intelligence triggers, copying Savage Beating.
3. 3Resolve both Savage Beatings, causing you to get two additional combat phases after this one.
4. 4Move to your first combat phase.
5. 5Declare Tetsuo as an attacker. Tetsuo triggers, causing you to cast Mystic Retrieval without paying its mana cost, targeting Relearn.
6. 6Swarm Intelligence triggers, copying Mystic Retrieval, targeting Savage Beating.
7. 7Resolve both Mystic Retrievals, causing you to return Relearn and Savage Beating from your graveyard to your hand.
8. 8Move to your second combat phase.
9. 9Repeat steps 1 through 4 one additional time.
10. 10Declare Tetsuo as an attacker. Tetsuo triggers, causing you to cast Relearn without paying its mana cost, targeting Mystic Retrieval.
11. 11Swarm Intelligence triggers, copying Relearn, targeting Savage Beating.
12. 12Resolve both Relearns, causing you to return Mystic Retrieval and Savage Beating from your graveyard to your hand.
13. 13Move to your second combat phase, and repeat from step 1.

Effects

• Infinite combat phases
• Infinite magecraft triggers
• Infinite mana creatures you control can produce
• Infinite storm count
• Infinite untap of creatures you control