Show Only Guru Approved Combos
Mana MagusMagus of the Candelabra Buy + Sword of the Paruns Buy + Mana Reflection Buy
The Reflection can be swapped for Heartbeat of Spring Buy, Mana Flare Buy, Mirari's Wake Buy, Dictate of Karametra Buy, Overabundance Buy, Zhur-Taa Ancient Buy, etc.
As soon as you can produce 4 or more mana from tapping all your lands, this is infinite.
Not original, posting because the previous iteration using Sword was limited to basic lands.
Flight controlArchetype of Imagination Buy + Aboshan, Cephalid Emperor Buy
3 blue taps all creatures you don’t control
Tainted fireTainted Strike Buy + Phyrexian Dreadnought Buy + Soul's Fire Buy
: kill your opponent.
Play Dreadnought; before sac resolves play Tainted Strike and than Soul's fire --> 13 poison counters to your opponent
Zubera DeathmantleDripping-Tongue Zubera Buy + Nim Deathmantle Buy + Ashnod's Altar Buy
I searched to find that it hadn't been posted with the Deathmantle, please do not rate for originality.
It is infinite ETB/LTB triggers. If you can either move the Deathmantle over after the first iteration or you have another Zubera die that turn, it is also infinite colorless mana and Spirit tokens.
Incidentally, Arcane Adaptation Buy or Conspiracy Buy also make it infinite tokens and mana.
Varchild's IllnessVarchild's War-Riders Buy + Illness in the Ranks Buy + Tainted Aether Buy
During your upkeep, opponent either sacrifices non-Survivor creatures or lands based on the number of age counters on Varchild's War-Riders Buy.
More Useless Artifact StuffSynod Artificer Buy + Doubling Cube Buy + Thousand-Year Elixir Buy
Pretty straight-forward. Starting with 10 mana in pool and all three untapped, this is infinite untapping of any number of noncreature artifacts and infinite mana.
1. Tap Cube - (10 - 3 = 7 * 2 = 14 mana)
2. Tap Artificer, target Elixir and Cube. (14 - 2 = 12)
3. Hold priority, active Elixir (12 - 1 = 11 mana)
4. Repeat as desired.
Turn 2 indestructable 5/5Ensoul Artifact Buy + Darksteel Citadel Buy
Technically synergy, but I think it's noteworthy given the strength. I'm surprised this hasn't been posted yet (or maybe it has on some other site).
Deadeye Double FishDeepglow Skate Buy + Deadeye Navigator Buy + Gemstone Array Buy
Really expensive, but viable in commander. With four counters on the Gemstone Array Buy, it doubles all other counters. With five or more counters on the Array, it is also infinite mana.
Full GY Combo Challenge PauperSongs of the Damned Buy + Blood Celebrant Buy + Reaping the Graves Buy
Alternative win-con for 1LandSpy in pauper. Have fun finding your 3 Creature combo for the oblivion
if you don't know
"It's a win/win situation" - Bones ConwaySoul Link Buy + Lust for War Buy + Darien, King of Kjeldor Buy
Have Darien, King of Kjeldor in play. Enchant an opponent's creature with Soul Link and Lust for War. When that creature attacks every turn just let it hit you. Your opponent will take 3 damage every turn, you will get hit, gain the life back and raise an army of 1/1s.