Kiora and Jodah sitting in a tree...

I have been trying to shoehorn Jodah into a Karn build, but I was so very wrong. Kiora and Jodah are a couple (KioJo) Because her first ability, Crashing Waves, just straight up gives mana.

Creatures:
Jodah, Archmage Eternal
Grand Warlord Radha

Spells:
Karn's Temporal Sundering
Overflowing Insight
Day's Undoing
Kamahl's Druidic Vow
Thunderherd Migration

Supports:
Mox Amber
Antiquities War
Powerstone Shard

Everything just feeds mana which means you can cast some of all of your hand every turn, and you get to draw new hands all the time.

Casting Day's Undoing and attacking with Radha and Jodah means you'll have 2 things to cast right away next turn, and using Crashing Waves can make the next 2 spells castable, and then matching something means you just cast 5 things. Overflowing Insight on a hand of everything with 3 mana means you cast your hand. 

There's no loop because Jodah's effect occurs at the start of your turn, but you basically get to cast everything each turn.