Grand Architect + Pili-Pala
a and use Grand Architect's first ability to turn Pili-Pala into a blue creature. Then Using Grand Architect's second ability, Pili-Pala (which is now a blue creature) to get mana. Use that mana and Pili-Pala to trigger it's ability, to generate 1 mana of any color. Rinse and Repeat for Infinite Mana of any color.
Argothian Elder + Maze of Ith + land
Attack with Arogthian Elder, use Maze of Ith to it. Then Argothian Elder (which is still attacking) and Maze of Ith as your first land, and any other land as the second. All of this must occur after the declare attackers step but before combat damage is dealt
Necrotic Ooze with both Devoted Druid & Morselhoarder in graveyard.
The Necrotic Ooze has the abilities of both the Devoted Druid & Moreselhoarder. This allows you to the Ooze, generating and a -1/-1 counter, then eat that counter to generate of any color and the Ooze.
Angelic Renewal + Sun Titan + Phyrexian Altar
Nim Deathmantle + Grave Titan + Ashnod's Altar
4xAxebane Guardian + Galvanic Alchemist or Crab Umbra
Heritage Druid + 2xElves + Imperious Perfect + Intruder Alarm
Deadeye Navigator + Palinchron or Great Whale
Candelabra of Tawnos + Glimmerpost or Cloudpost + Voltaic Key
Bloom Tender + Freed from the Real
2xKiora's Follower + Illusionist's Bracers + 1 Land
a land. Then the Kiora's that is enchanted, immediatly the un-enchanter Kiora's and the enchanted one. Then using the options from the enchanter Kiora that are still on the stack, the unenchanted Kiora's and the land. all 3 cards are now untapped, and you have 1 mana on the stack.
Mana Echoes + Sliver Queen *oversized*
Voyaging Satyr + Freed from the Real + Simic Growth Chamber