Bristly Bill, Spine Sower + Devoted Druidearly
Infinite green mana, Infinite +1/+1 counters on certain creatures
Devoted Druid + Luxior, Giada's Giftearly
Infinite green mana
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
Staff of Domination + Priest of Titaniaearly
Infinite card draw, Infinite draw triggers, Infinite lifegain, Infinite lifegain triggers, Infinite untap of creatures you control, Infinite mana creatures you control can produce, Infinite green mana
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 + Priest of Titaniaearly
Infinite green mana, Infinitely large creature until end of turn, Infinite untap of creatures you control, Infinite mana creatures you control can produce
Haldir, Lórien Lieutenant + Devoted Druid
Infinite green mana, Infinite power and toughness for certain creatures until end of turn
Staff of Domination + Circle of Dreams Druid
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 + Elvish Archdruid
Infinite card draw, Infinite draw triggers, Infinite lifegain, Infinite lifegain triggers, Infinite untap of creatures you control, Infinite mana creatures you control can produce, Infinite green mana
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 + Wirewood Channeler
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
Tyvar, the Pummeler + Devoted Druid
Infinite green mana, Infinitely large creatures you control until end of turn
Umbral Mantle + Circle of Dreams Druid
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 + Elvish Archdruid
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 + 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 + Wirewood Channeler
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.