Birgi, God of Storytelling // Harnfel, Horn of Bounty + Slumbering Dragon Combos

3 known combos featuring both cards in Commander

Infinite ETB Infinite LTB Infinite storm count Infinite creature tokens Infinite death triggers

Combo 1 with Lathliss, Dragon Queen + Cloudstone Curio

Results: Infinite creature tokens · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers · Infinite storm count
Steps
  1. Cast Slumbering Dragon by paying {R}.
  2. Birgi triggers, adding {R}.
  3. Slumbering Dragon enters the battlefield, triggering Cloudstone Curio and Lathliss.
  4. Resolve the Cloudstone Curio trigger, choosing not to return anything to your hand from the battlefield.
  5. Resolve the Lathliss trigger, creating a 5/5 Dragon creature token.
  6. The Dragon enters the battlefield, triggering Cloudstone Curio, returning Slumbering Dragon from the battlefield to your hand.
  7. Repeat.

Combo 2 with Ganax, Astral Hunter + Cloudstone Curio + Shivan Devastator

Results: Infinite +1/+1 counters on a creature · Infinite colored mana · Infinite ETB · Infinite LTB · Infinite storm count · Infinite Treasure tokens
Show steps
  1. Cast Slumbering Dragon by paying {R}.
  2. Birgi triggers, adding {R}.
  3. When Slumbering Dragon enters the battlefield, Ganax and Cloudstone Curio trigger.
  4. Resolve the Ganax trigger, creating a Treasure artifact token.
  5. Resolve the Cloudstone Curio trigger, returning Shivan Devastator from the battlefield to your hand.
  6. Activate the Treasure by tapping and sacrificing it, adding {1}.
  7. Cast Shivan Devastator by paying {1}{R}, causing it to enter the battlefield with a +1/+1 counter on it.
  8. Birgi triggers, adding {R}.
  9. When Shivan Devastator enters the battlefield, Ganax and Cloudstone Curio trigger.
  10. Resolve the Ganax trigger, creating a Treasure artifact token.
  11. Resolve the Cloudstone Curio trigger, returning Slumbering Dragon from the battlefield to your hand.
  12. Repeat.
  13. Once you have infinite mana, you may cast Shivan Devastator for an arbitrarily large amount of mana to put infinite +1/+1 counters on it.

Combo 3 with Miirym, Sentinel Wyrm + Cloudstone Curio

Results: Infinite creature tokens · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers · Infinite storm count
Show steps
  1. Cast Slumbering Dragon by paying {R}.
  2. Birgi triggers, adding {R}.
  3. Slumbering Dragon enters the battlefield, triggering Cloudstone Curio and Miirym.
  4. Resolve the Cloudstone Curio trigger, choosing not to return anything to your hand from the battlefield.
  5. Resolve the Miirym trigger, creating a token copy of Slumbering Dragon.
  6. The Slumbering Dragon token enters the battlefield, triggering Cloudstone Curio, returning the nontoken Slumbering Dragon from the battlefield to your hand.
  7. Repeat.
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