How can you create a combo with Yenna, Redtooth Regent, Siona, Captain of the Pyleas, Ashnod's Altar?
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[START OF COMBO]This combo can be formed with Yenna, Redtooth Regent, Siona, Captain of the Pyleas, Ashnod's Altar

Color identity: GW
Mana cost: {2}
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.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite scry 2[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - You have at least one Aura on the battlefield attached to a creature you control.
  - Yenna does not have summoning sickness.
  - You control at least one additional creature excluding the creature that has the Aura attached to it.
[END OF COMBO PREREQUISITES]
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