Tymna Thrasios (EDH / Commander)

Although the only win conditions in the deck are Laboratory Maniac and Thassa's Oracle, there are several lines 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.
Demonic Consultation naming a card not in the decklist will allow you to put your library into your graveyard.
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 pretty 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.

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 in your command zone. By activating Thrasios, Trition 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.