Ashnod's Altar + Quasiduplicate Combos

2 known combos featuring both cards in Commander

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

Combo 1 with Specimen Collector

Also requires: Specimen Collector Specimen Collector
Results: Infinite colorless mana · Infinite creature tokens · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers
Steps
  1. Cast Quasiduplicate by paying {1}{U}{U}, creating a token copy of Specimen Collector.
  2. The Specimen Collector token enters the battlefield, creating a 1/1 Squirrel and a 0/3 Crab creature token.
  3. Activate Ashnod's Altar by sacrificing the nontoken Specimen Collector, adding {C}{C}.
  4. Specimen Collector dies, creating a token copy of the Specimen Collector token.
  5. Repeat from step 2.

Combo 2 with Rootha, Mercurial Artist + Hellkite Courser

Results: Infinite death triggers · Infinite ETB · Infinite LTB · Infinite magecraft triggers · Infinite sacrifice triggers
Show steps
  1. Cast Quasiduplicate by paying {1}{U}{U}, targeting Hellkite Courser.
  2. Holding priority, activate Rootha by paying {2} and returning it to your hand, targeting Quasiduplicate.
  3. Choose to have Rootha returned to the command zone instead of your hand.
  4. Resolve the Rootha ability, copying Quasiduplicate, targeting Hellkite Courser.
  5. Resolve the copy of Quasiduplicate, creating a token copy of Hellkite Courser.
  6. Hellkite Courser enters the battlefield, putting Rootha from the command zone onto the battlefield.
  7. Activate Ashnod's Altar by sacrificing the Hellkite Courser token, adding {C}{C}.
  8. Repeat from step 2.
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