Harmless Offering + Shilgengar, Sire of Famine Combos

2 known combos featuring both cards in Commander

Infinite LTB Infinite ETB Infinite sacrifice triggers Infinite death triggers Infinite Blood tokens

Combo 1 with Blightbeetle

Also requires: Blightbeetle Blightbeetle
Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite Blood tokens
Steps
  1. Donate Blightbeetle to an opponent
  2. Activate Shilgengar by sacrificing the undying creature.
  3. When the undying creature dies, its undying ability triggers, returning itself from your graveyard to the battlefield without a +1/+1 counter on it due to Blightbeetle.
  4. Resolve the Shilgengar ability.
  5. Repeat from step 2.

Combo 2 with Yarus, Roar of the Old Gods + Karlov Watchdog

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite Blood tokens
Show steps
  1. Cast Harmless Offering by paying its mana cost, giving control of Karlov Watchdog to an opponent.
  2. During the opponent's turn, activate Shilgengar by sacrificing a face-down creature you control.
  3. When the creature dies, Yarus's second ability triggers, returning it from your graveyard to the battlefield face-down as a 2/2 creature, and then not turning it face-up due to Karlov Watchdog.
  4. Resolve the Shilgengar ability.
  5. Repeat from step 2.
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