All 8 Combos with Manaform Hellkite

Birgi, God of Storytelling // Harnfel, Horn of Bounty + Manaform Hellkite + Mana Echoes + Haze of Rage

Infinite Mana: Infinite colorless mana, Infinite creature tokens with haste, Infinite ETB, Infinite LTB, Infinitely powerful creatures you control until end of turn, Infinite magecraft triggers, Infinite storm count

Cast Haze of Rage with buyback by paying {3}{R}. Birgi, Manaform Hellkite and Haze of Rage's storm ability trigger. Resolve the Birgi trigger, adding {R}. Resolve the Manaform Hellkite trigger, creating a 5/5 Dragon Illusion creature token with haste. The Dragon Illusion enters the battlefield, triggering Mana Echoes, adding at least {C}{C}{C}. Resolve the Haze of Rage trigger, creating a copy of it for each spell cast before it this turn. Resolve each copy of Haze of Rage, giving your creatures +1/+0 until end of turn for each copy. Resolve the original Haze of Rage, giving your creatures +1/+0 until end of turn and returning Haze of Rage to your hand. Repeat.