Phyrexian Altar + Spark Double Combos

2 known combos featuring both cards in Commander

Infinite card draw Infinite draw triggers Near-infinite +1/+1 counters on a creature Near-infinite colored mana Near-infinite death triggers

Combo 1 with Body Launderer + Clever Impersonator

Results: Infinite card draw · Infinite draw triggers · Near-infinite +1/+1 counters on a creature · Near-infinite colored mana · Near-infinite death triggers · Near-infinite ETB · Near-infinite LTB · Near-infinite sacrifice triggers
Steps
  1. Activate Phyrexian Altar by sacrificing Clever Impersonator, adding one mana of any color.
  2. Clever Impersonator dies, triggering its second ability and Body Launderer's first ability.
  3. Resolve the Clever Impersonator trigger, returning Spark Double from your graveyard to the battlefield as a copy of Body Launderer.
  4. Resolve the Body Launderer trigger, causing it to connive.
  5. Activate Phyrexian Altar by sacrificing Spark Double, adding one mana of any color.
  6. Spark Double dies, triggering its second ability and Body Launderer's first ability.
  7. Resolve the Spark Double trigger, returning Clever Impersonator from your graveyard to the battlefield as a copy of Body Launderer.
  8. Resolve the Body Launderer trigger, causing it to connive.
  9. Repeat.

Combo 2 with Medomai the Ageless + Alesha, Who Smiles at Death

Results: Infinite turns · Lock
Show steps
  1. Declare Alesha as an attacker.
  2. Alesha triggers, causing you to pay {U/B}{U/B} to return Spark Double from your graveyard to the battlefield tapped and attacking as a nonlegendary copy of Medomai the Ageless.
  3. Deal combat damage using Spark Double.
  4. Spark Double triggers, causing you to take an extra turn after this one.
  5. Activate Phyrexian Altar by sacrificing Spark Double
  6. Repeat each turn.
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