Kinnan 1 Turn WinI got curious and decided to actually look into it, and discovered Kinnan can win on turn one with a minimum 7 card hand. It only takes 6 in EDH.
The way it works (if it isn't obvious) is like this:
1. Play your land. The specific card can change depending on the mana rocks being used for the combo.
2. Play your 0 CMC mana rocks, fulfilling any casting requirements.
3. Tap your land and a mana rock that can produce your missing color to play
Kinnan.
4. Tap your remaining mana rock for 2 to play either
Sol Ring,
Mana Crypt,
Mana Vault, or
Grim Monolith.
5. Tap your final mana rock for 3+ to play
Basalt Monolith.
6. Win using
Walking Ballista and the infinite colorless mana produced by
Kinnan and
Basalt Monolith.