Stangg, Echo Warrior + Éomer, Marshal of Rohan + Helm of the Host

Prerequisites

• Helm of the Host attached to Éomer.
• 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, Helm of the Host triggers, creating a nonlegendary token copy of Éomer with haste.
2. 2Declare Stangg and the additional legendary creature as attackers.
3. 3Stangg triggers, creating a 3/4 Stangg Twin creature token that is tapped and attacking.
4. 4Holding priority, kill the additional legendary creature.
5. 5When the creature dies, each Éomer that has not triggered this turn triggers, causing you to untap all creatures you control and to get at least one additional combat phase after this one.
6. 6Move to your next combat phase.
7. 7At the beginning of your combat phase, Helm of the Host triggers, creating a nonlegendary token copy of Éomer with haste.
8. 8Declare Stangg as an attacker.
9. 9Stangg triggers, creating a 3/4 Stangg Twin creature token that is tapped and attacking.
10. 10Put either Stangg Twin token into your graveyard due to the legend rule.
11. 11Repeat from step 5.

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