Ashnod's Altar + Retreat to Coralhelm Combos

2 known combos featuring both cards in Commander

Infinite death triggers Infinite ETB Infinite landfall triggers Infinite LTB Infinite sacrifice triggers

Combo 1 with Othelm, Sigardian Outcast + Ashaya, Soul of the Wild

Results: Infinite death triggers · Infinite ETB · Infinite landfall triggers · Infinite LTB · Infinite sacrifice triggers
Steps
  1. Activate Ashnod's Altar by sacrificing another nontoken creature, adding {C}{C}.
  2. Activate Othelm by paying {2} and tapping it, returning a nontoken creature from your graveyard to the battlefield.
  3. The creature enters the battlefield, triggering Retreat to Coralhelm, untapping Othelm.
  4. Repeat.

Combo 2 with Galadriel of Lothlórien + Dryad Arbor + Mortuary

Also requires: Galadriel of Lothlórien Galadriel of Lothlórien Dryad Arbor Dryad Arbor Mortuary Mortuary
Results: Infinite colorless mana · Infinite death triggers · Infinite ETB · Infinite landfall triggers · Infinite LTB · Infinite sacrifice triggers
Show steps
  1. Play Dryad Arbor.
  2. When Dryad Arbor enters the battlefield, Retreat to Coralhelm triggers.
  3. Holding priority, activate Ashnod's Altar by sacrificing Dryad Arbor, adding {C}{C}.
  4. When Dryad Arbor dies, Mortuary triggers, putting Dryad Arbor on top of your library from your graveyard.
  5. Resolve the Retreat to Coralhelm trigger from step 2, causing you to scry 1, ensuring to leave Dryad Arbor on top of your library.
  6. Galadriel's second ability triggers, causing you to reveal Dryad Arbor from the top of your library, and put it onto the battlefield tapped.
  7. Repeat from step 2.
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