The Master, Multiplied + Cybermen Squadron + Encroaching Mycosynth + Combat Celebrant

Prerequisites

• Opponents cannot block and kill creatures you control.
• You have at least two opponents.

Steps

1. 1Declare Combat Celebrant as an attacker, choosing to exert it as it attacks.
2. 2Combat Celebrant's myriad and printed abilities trigger.
3. 3Resolve the myriad trigger, creating a token copy of Combat Celebrant attacking each other opponent.
4. 4Resolve the second trigger, causing you to untap all other creatures you control and to get an additional combat phase after this one.
5. 5Move to your next combat phase, not exiling the Combat Celebrant tokens due to The Master.
6. 6Repeat using a Combat Celebrant token that hasn't attacked this turn.

Effects

• Infinite combat phases
• Infinite creature ETB
• Infinite creature tokens