Bristly Bill, Spine Sower + Devoted Druidearly
Infinite green mana, Infinite +1/+1 counters on certain creatures
Staff of Domination + Gyre Sageearly
Infinite card draw, Infinite draw triggers, Infinite lifegain, Infinite lifegain triggers, Infinite mana creatures you control can produce, Infinite untap of creatures you control, Infinite green mana
Umbral Mantle + Fanatic of Rhonasearly
Infinite green mana, Infinitely large creature until end of turn, Infinite untap of creatures you control, Infinite mana creatures you control can produce
Umbral Mantle + Gyre Sageearly
Infinite green mana, Infinitely large creature until end of turn, Infinite untap of creatures you control, Infinite mana creatures you control can produce
Umbral Mantle + Incubation Druidearly
Infinitely large creature until end of turn
Staff of Domination + Kami of Whispered Hopes
Infinite card draw, Infinite colored mana, Infinite draw triggers, Infinite lifegain, Infinite lifegain triggers, Infinite mana creatures you control can produce, Infinite untap of creatures you control
Staff of Domination + Marwyn, the Nurturer
Infinite card draw, Infinite draw triggers, Infinite lifegain, Infinite lifegain triggers, Infinite mana creatures you control can produce, Infinite untap of creatures you control, Infinite green mana
Staff of Domination + Selvala, Heart of the Wilds
Infinite card draw, Infinite colored mana, Infinite draw triggers, Infinite lifegain, Infinite lifegain triggers, Infinite mana creatures you control can produce, Infinite untap of creatures you control
Umbral Mantle + Kami of Whispered Hopes
Infinite colored mana, Infinitely large creature until end of turn, Infinite untap of creatures you control, Infinite mana creatures you control can produce
Umbral Mantle + Marwyn, the Nurturer
Infinite green mana, Infinitely large creature until end of turn, Infinite untap of creatures you control, Infinite mana creatures you control can produce
Umbral Mantle + Selvala, Heart of the Wilds
Infinite colored mana, Infinitely large creature until end of turn, Infinite untap of creatures you control, Infinite mana creatures you control can produce
Combo data from Commander Spellbook. “Early” combos (cheap enough to win in the first few turns) put a deck at Bracket 4; the rest are at home in Bracket 3.