Helm of the Host + Phyrexian Altar Combos

2 known combos featuring both cards in Commander

Infinite combat phases Infinite death triggers Infinite ETB Infinite LTB Infinite sacrifice triggers

Combo 1 with Éomer, Marshal of Rohan + Kari Zev, Skyship Raider

Also requires: Éomer, Marshal of Rohan Éomer, Marshal of Rohan Kari Zev, Skyship Raider Kari Zev, Skyship Raider
Results: Infinite combat phases · Infinite creature tokens with haste · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers · Infinite colored mana
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 Kari Zev as an attacker.
  3. Kari Zev triggers, creating a legendary 2/1 Ragavan creature token that is tapped and attacking.
  4. Holding priority, activate Phyrexian Altar by sacrificing Ragavan, adding {1}.
  5. When Ragavan dies, each Éomer that hasn't triggered this turn triggers, untapping all creatures you control and causing you to get at least one additional combat phase after this one.
  6. Repeat each combat phase.

Combo 2 with Najeela, the Blade-Blossom + Brudiclad, Telchor Engineer

Results: Infinite colored mana · Infinite combat damage · Infinite combat phases · Infinite creature tokens · Infinite death triggers · Infinite ETB · Infinite lifegain · Infinite lifegain triggers · Infinite LTB · Infinite sacrifice triggers
Show steps
  1. At the beginning of combat, Helm of the Host and Brudiclad trigger.
  2. Resolve Helm of the Host's trigger, creating a nonlegendary copy of Najeela with haste.
  3. Resolve Brudiclad's trigger, creating a token, then causing all tokens you control to become copies of the nonlegendary Najeela token with haste.
  4. Attack with at least three Najeela creatures.
  5. Each Najeela triggers at least three times each, creating a total of at least nine Warrior tokens that are tapped and attacking.
  6. Activate Phyrexian Altar at least five times by sacrificing at least five Warrior tokens, adding at least {W}{U}{B}{R}{G}.
  7. Pay {W}{U}{B}{R}{G} to activate any Najeela, untapping all attacking creatures, giving them trample, lifelink, and haste until end of turn, and creating an additional combat phase after this one.
  8. Deal combat damage, gaining life equal to the amount of damage dealt.
  9. Repeat.
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