Birgi, God of Storytelling // Harnfel, Horn of Bounty + Bloodflow Connoisseur Combos

3 known combos featuring both cards in Commander

Infinite +1/+1 counters on a creature Infinite LTB Infinite ETB Infinite sacrifice triggers Infinite death triggers

Combo 1 with Rakdos, the Muscle + Shambling Ghast + Haunted Crossroads

Results: Infinite +1/+1 counters on a creature · Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite storm count
Steps
  1. Activate Bloodflow Connoisseur by sacrificing Shambling Ghast.
  2. When Shambling Ghast dies, it and Rakdos trigger.
  3. Resolve the Shambling Ghast trigger, creating a Treasure token.
  4. Activate the Treasure by tapping and sacrificing it, adding {B}.
  5. Holding priority, activate Haunted Crossroads by paying {B}, putting Shambling Ghast from your graveyard onto the top of your library.
  6. Resolve the Rakdos trigger, exiling Shambling Ghast from the top of your library with the ability to cast it until your next turn.
  7. Resolve the Bloodflow Connoisseur ability, putting a +1/+1 counter on it.
  8. Cast Shambling Ghast from exile by paying {1}.
  9. Birgi triggers, adding {R}.
  10. Repeat.

Combo 2 with Dargo, the Shipwrecker

Results: Infinite +1/+1 counters on a creature · Infinite commander casts · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers · Infinite storm count
Show steps
  1. Cast Dargo from the command zone by paying {R}.
  2. Birgi triggers, adding {R}.
  3. Activate Bloodflow Connoisseur by sacrificing Dargo.
  4. Choose to return Dargo to the command zone from your graveyard.
  5. Resolve the Bloodflow Connoisseur ability, putting a +1/+1 counter on it.
  6. Repeat.

Combo 3 with Rakdos, the Muscle + Priest of Gix + Haunted Crossroads

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite storm count · Infinite +1/+1 counters on a creature · Exile your library with the ability to play the exiled cards until your next turn
Show steps
  1. Activate Bloodflow Connoisseur by sacrificing Priest of Gix.
  2. When Priest of Gix dies, Rakdos triggers.
  3. Holding priority, activate Haunted Crossroads by paying {B}, putting Priest of Gix from your graveyard onto the top of your library.
  4. Resolve the Rakdos trigger, causing you to exile the top three cards of your library with the ability to play them until your next end step.
  5. Resolve the Bloodflow Connoisseur ability from step 1, putting a +1/+1 counter on it.
  6. Cast Priest of Gix from exile by paying {3}.
  7. Birgi triggers, adding {R}.
  8. When Priest of Gix enters the battlefield, it triggers, adding {B}{B}{B}.
  9. Repeat.
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