Geralf's Messenger + Necrosynthesis Combos

1 known combo featuring both cards in Commander

Infinite +1/+1 counters on a creature Infinite colorless mana Infinite death triggers Infinite ETB Infinite lifeloss

Combo 1 with Tayam, Luminous Enigma + Ashnod's Altar

Results: Infinite +1/+1 counters on a creature · Infinite colorless mana · Infinite death triggers · Infinite ETB · Infinite lifeloss · Infinite LTB · Infinite sacrifice triggers · Infinite self-mill · Put a selection of permanant cards from your library and graveyard onto the battlefield
Steps
  1. Activate Ashnod's Altar by sacrificing Geralf's Messenger, adding {C}{C}.
  2. When Geralf's Messenger dies, its undying ability and Necrosynthesis trigger.
  3. Resolve the Geralf's Messenger trigger, returning it from your graveyard to the battlefield with a +1/+1 counter and a vigilance counter on it.
  4. When Geralf's Messenger enters the battlefield, it triggers, causing an opponent to lose 2 life.
  5. Resolve the Necrosynthesis trigger, putting a +1/+1 counter on Tayam.
  6. Activate Tayam by paying {3}, removing a +1/+1 counter from Tayam, and both counters from Geralf's Messenger.
  7. Holding priority, activate Ashnod's Altar by sacrificing Geralf's Messenger, adding {C}{C}.
  8. Repeat steps 2-5 one additional time.
  9. Activate Ashnod's Altar by sacrificing Geralf's Messenger, adding {C}{C}.
  10. Resolve Tayam's ability from step 6, causing you to mill three cards and returning Geralf's Messenger from your graveyard to the battlefield.
  11. When Geralf's Messenger enters the battlefield, it triggers, causing an opponent to lose 2 life.
  12. Repeat.
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