How can you create a combo with Stangg, Echo Warrior, Éomer, Marshal of Rohan, Helm of the Host?
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[START OF COMBO]This combo can be formed with Stangg, Echo Warrior, Éomer, Marshal of Rohan, Helm of the Host

Color identity: RG
Mana cost: 
Steps:
  1. At the beginning of your combat phase, Helm of the Host triggers, creating a nonlegendary token copy of Éomer with haste.
  2. Declare Stangg and the additional legendary creature as attackers.
  3. Stangg triggers, creating a 3/4 Stangg Twin creature token that is tapped and attacking.
  4. Holding priority, kill the additional legendary creature.
  5. When 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. Move to your next combat phase.
  7. At the beginning of your combat phase, Helm of the Host triggers, creating a nonlegendary token copy of Éomer with haste.
  8. Declare Stangg as an attacker.
  9. Stangg triggers, creating a 3/4 Stangg Twin creature token that is tapped and attacking.
  10. Put either Stangg Twin token into your graveyard due to the legend rule.
  11. Repeat from step 5.[END OF COMBO STEPS]

Result:
  - Infinite combat phases
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mana creatures you control can produce
  - Infinite untap of creatures you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - 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.
[END OF COMBO PREREQUISITES]
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