Altar of Dementia + Sneak Attack Combos

2 known combos featuring both cards in Commander

Infinite LTB Infinite ETB Infinite sacrifice triggers Infinite death triggers Infinite mill

Combo 1 with Garna, the Bloodflame + Pitiless Plunderer

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite mill · Infinite self-mill · Infinite blinking
Steps
  1. Activate Sneak Attack by paying {R}, putting Garna from your hand onto the battlefield.
  2. When Garna enters the battlefield, it triggers.
  3. Holding priority, activate Altar of Dementia by sacrificing Garna.
  4. When Garna dies, Pitiless Plunderer triggers, creating a Treasure token.
  5. Resolve the Altar of Dementia ability.
  6. Resolve the Garna trigger, returning it from your graveyard to your hand.
  7. Activate the Treasure by tapping and sacrificing it, adding {R}.
  8. Repeat.

Combo 2 with Garna, the Bloodflame + Diamond Lion

Results: Infinite ETB · Infinite LTB · Infinite colored mana · Infinite death triggers · Infinite mill · Infinite recursion of creature cards in your graveyard · Infinite sacrifice triggers · Infinite self-mill
Show steps
  1. Activate Sneak Attack by paying {R}, putting Diamond Lion from your hand onto the battlefield.
  2. Activate Sneak Attack by paying {R}, putting Garna from your hand onto the battlefield.
  3. When Garna enters, it triggers.
  4. Holding priority, activate Diamond Lion by tapping and sacrificing it, adding {R}{R}{R}.
  5. Activate Altar of Dementia by sacrificing Garna.
  6. Resolve the Garna ability from step 3, returning all creature cards that were put in your graveyard this turn to your hand.
  7. Repeat.
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