Thrasios and Tymna (EDH / Commander)

Must give credit to TyVarney on tappedout for this awesome decklist I've been adjusting. It can win on turn 1, but more often turn 3-4. This thing is brutal! The most competitive deck I've played.

One-turn win would be: Demonic Consultation to exile your whole library (naming a card not in the deck list and using Mox Diamond as your black mana source), then using an Island and a Lotus Petal to cast Thassa's Oracle.

Here's how it works:

The only win conditions in the deck are Laboratory Maniac and Thassa's Oracle, but there are several routes that will lead to that final goal.

Hermit Druid is usually Plan A. Activating Hermit Druid will allow you to put your library into your graveyard (there are no basic lands in the deck).

Demonic Consultation naming a card not in the decklist will allow you to put your library into exile.

Cephalid Illusionist + Nomads en-Kor will allow you to put your library into your graveyard. (This is commonly known as the "Cephalid Breakfast" combo.)

Auriok Salvagers + Lion's Eye Diamond will allow you to generate infinite mana of any combination of colors. (This is commonly known as the "Bomberman" combo.)

Ad Nauseam + Angel's Grace will allow you to draw your entire library.

"Combo-ing off" with any of the above lines will lead you down one of three roads:

1 - You will mill your entire library into your graveyard.

From this point, the path to victory gets a little complicated. While milling your library Narcomoeba will trigger and come into play. With one blue mana you can unearth Fatestitcher, and use the activated ability to refund the mana if need be. At this point, the simplest path to victory is sacrificing three creatures (usually Narcomoeba, Hermit Druid and Fatestitcher) to flashback Dread Return targeting Thassa's Oracle. If you use Demonic Consultation to exile your library, you'll need to follow it up with Thassa's Oracle or Laboratory Maniac to win.

2 - You will have 'infinite' mana.

This path to victory is a little more straight forward. Thrasios, Triton Hero functions as a great infinite mana dump. By activating Thrasios, Triton Hero's activated ability a number of times equal to the number of cards in your library you draw each non-land card and put every land into play tapped. At this point, the simplest path to victory is casting Thassa's Oracle.

3 - You will have your entire library in your hand.

This path to victory is very similar to #2 above. You simply need to cast Thassa's Oracle.

Other than the combo pieces, almost every other card in the deck is dedicated to providing access to faster mana, tutoring for combo pieces, or protecting the various combos from almost all types of interaction that could be used.

If you mill your entire library and somehow your plan fizzles, or an opponent has enough interaction to stop you from winning, Memory's Journey or Flash of Insight can prevent a loss and/or set up a win for the next turn.

If Laboratory Maniac, Thassa's Oracle, and/or Dread Return are in your hand, Cabal Therapy can be used to get the relevant combo pieces out of your hand and into your graveyard.