Ashnod's Altar + Siona, Captain of the Pyleas Combos

4 known combos featuring both cards in Commander

Infinite death triggers Infinite ETB Infinite LTB Infinite sacrifice triggers Infinite colorless mana

Combo 1 with Reins of the Vinesteed

Results: Infinite colorless mana · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers
Steps
  1. Cast Reins of the Vinesteed by paying {3}{G}, enchanting any Human or Soldier you control besides Siona.
  2. Siona triggers, creating a 1/1 Human Soldier creature token.
  3. Activate Ashnod's Altar by sacrificing the creature enchanted by Reins of the Vinesteed, adding {C}{C}.
  4. The creature dies, triggering Reins of the Vinesteed, returning Reins of the Vinesteed to the battlefield enchanting the Human Soldier token.
  5. Siona triggers, creating a 1/1 Human Soldier creature token.
  6. Repeat from step 3.

Combo 2 with Yenna, Redtooth Regent

Results: Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers · Infinite scry
Show steps
  1. Activate Yenna by paying {2} and tapping it, creating a token copy of any Aura you control attached to any other creature you control, then causing you to untap Yenna and scry 2.
  2. Siona's second ability triggers, creating a 1/1 Human Soldier creature token.
  3. Activate Ashnod's Altar by sacrificing the creature that has the Aura token attached to it, adding {C}{C}.
  4. Repeat.

Combo 3 with Traveling Plague

Also requires: Traveling Plague Traveling Plague
Results: Infinite ETB · Infinite LTB · Infinite colorless mana · Infinite death triggers · Infinite sacrifice triggers
Show steps
  1. Cast Traveling Plague by paying {3}{B}{B}, attaching it to another creature you control.
  2. When Traveling Plague enters, Siona triggers, creating a creature token.
  3. Activate Ashnod's Altar by sacrificing the creature Traveling Plague is attached to.
  4. When the creature dies, Traveling Plague triggers, returning itself from your graveyard to the battlefield attached to the token created in step 2.
  5. When Traveling Plague enters, Siona triggers, creating a creature token.
  6. Repeat from step 3.

Combo 4 with Cass, Hand of Vengeance

Results: Infinite ETB · Infinite LTB · Infinite colorless mana · Infinite death triggers · Infinite sacrifice triggers
Show steps
  1. Activate Ashnod's Altar by sacrificing another creature that has an Aura attached to it.
  2. When the creature dies, Cass triggers, returning an Aura that was attached to the creature from your graveyard to the battlefield attached to another creature you control.
  3. When the Aura enters the battlefield, Siona triggers, creating a creature token.
  4. Repeat.
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