Oops! All Lands - Cultivator Colossus OTK [EDH] (EDH / Commander)

Cultivator Collosus is a new card spoilered for Innistrad: Crimson Vow. It's a trampling creature for {4}{G}{G}{G} whose power and toughness is equal to the number of lands you control.
More importantly, when it enters the battlefield, you may put a land from your hand onto the battlefield. If you do, draw a card and repeat this process.
If your entire deck is just lands and Thassa's Oracle, this trigger would win the game on the spot - thus the idea for this deck was born.
We will include some tutors, which means we need to count and keep enough lands in hand in order to actually draw our full deck with the Colossus trigger.

The goal of this deck is to cheat out Collossus and Oracle using polymorph effects. For this, the ideal commander pair is Thrasios//Rograkh, as they provide the right colors, cheap polymorph fodder and card draw plus ramp with Thrasios.
Ideally, we use Divergent Transformations or Mass Polymorph with both commanders in play to win immediately. Tokens from Khalni Garden and Kher Keep or cheap manlands like Mutavault can also be polymorphed, these lands also help out as chump blockers if needed.
Proteus Staff is a nice addition, as it's a repeatable Polymorph effect for just 3 mana. It can also be used to put Thassa's Oracle back into our deck if we get unlucky and polymorph into it without hitting Colossus first.
Defense of the Heart is slower and more likely to be disrupted, but as it can tutor both creatures at once it's still a good include.
Polymorph and Transmogrify are semi-viable. The problem is there's a 50% chance to hit Oracle first and likely lose the game. because of this, their use should be avoided unless we have Oracle in hand, we have Proteus Staff or we're desperate enough to go for it anyways.
Riptide Laboratory can help recover Oracle when we do accidentally hit it. A second Polymorph can sac the Oracle to still get a Colossus trigger off, which can also win the game through combat damage from Dark Depths + Thespian's Stage or an army of tokens from Field of the Dead and Vesuva, so Oracle isn't our only win condition.
If you prefer consistency, run Mystical Tutor and Natural Order instead. Gamble is another potentially good include.

Among our lands, we run some card draw with Mikokoro, Center of the Sea, Desolate Lighthouse, Geier Reach Sanitarium and the Canopylands to help get the cards we need. If Thrasios is available, it's the far superior mana sink.
Maze of Ith, Labyrinth of Skophos, Mystifying Maze, Quicksand, Glacial Chasm, Halls of Mist, Island of Wak-Wak and The Tabernacle at Pendrell Vale can help to stall opponents until we can go off.
The most important land in the deck is Crumbling Vestige. During a Colossus Trigger, you can put Crumbling Vestige on the battlefield and then use Vesuva to copy it, thus generating the 2 blue mana needed to cast Thassa's Oracle and win the game. So unless absolutely necessary, don't play these lands even if you draw them - hold them for the combo.

The deck is ludicrously expensive because of a handful of reserved list lands in it (especially Tabernacle). I'd say just proxy them if you don't have them, but if you don't want to all of these can be omitted without the deck losing much power - the core components (besides Thrasios) are quite cheap and a functional version of the deck can easily be built for under 100$. Do note that this deck really sucks once opponents know what you're up to.