Stangg, Echo Warrior + Éomer, Marshal of Rohan + Rionya, Fire Dancer

Prerequisites

• Stangg does not have summoning sickness.
• An opponent cannot block and kill Stangg.
• You control another legendary creature that can attack this turn.
• You have a way to kill the additional legendary creature at instant speed.

Steps

1. 1At the beginning of your combat phase, Rionya triggers, creating at least one token copy of Éomer with haste.
2. 2Put all but the newest Éomer into your graveyard due to the legend rule.
3. 3Declare Stangg and the additional legendary creature as attackers.
4. 4Stangg triggers, creating a 3/4 Stangg Twin creature token that is tapped and attacking.
5. 5Holding priority, kill the additional legendary creature.
6. 6When the creature dies, the Éomer token triggers, causing you to untap all creatures you control and to get at least one additional combat phase after this one.
7. 7Move to your next combat phase.
8. 8At the beginning of your combat phase, Rionya triggers, creating at least one token copy of Éomer with haste.
9. 9Put all but the newest Éomer into your graveyard due to the legend rule.
10. 10Declare Stangg as an attacker.
11. 11Stangg triggers, creating a 3/4 Stangg Twin creature token that is tapped and attacking.
12. 12Put either Stangg Twin token into your graveyard due to the legend rule.
13. 13Repeat from step 6.

Effects

• Infinite combat phases
• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers
• Infinite mana creatures you control can produce
• Infinite untap of creatures you control