The owner of this deck hasn't added a sideboard, they probably should...
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Get lots of spawn tokens and Mass Polymorph for an epic win. Another option would be Polymorphing on a Darksteel or an Ulamog for a free huge creature. (comments appreciated!)
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I'd recommend both the Khalni Garden for plant tokens and the Zendikons to make your lands able to morph as well. The blue Zendikon only costs U, cheap way to get more targets for a mass morph.
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I think your way to get to 6 mana for the mass polymorph is the best way with eldrazi spawn. But here are my comments : - Having 4 garruk, like every other planewalker in a deck is too much. Play with 2-3 max. - I would be using see beyond (blue color). Think about having the one monster you need in your hand, you can shuffle it in your library with this one, while drawing two cards - I recommend you to play with fetch land for your island, rather than have more island. You have only polymorph and mass polymorph of these color, so one is enough. Terramorphic expanse is a cheap one and gets the job done - Instead of your two colossus, why don't play one AND the Madrush Cyclops. You'll win the game with your haste creature the turn you cast mass polymorph. - Please, make a sideboard