Play Extra Lands Beyond the typical green land ramp spells youre going to put in the deck, Multani wants ways to play extra lands in a given turn
You can't choose different modes
After sampling the popular formats around me though, I came to the realization that if I played any of them that would not allow the best cards in the game, the truly powerful and legendary, I was cheating myself out of a hell of a lot of fun
Extirpate and Surgical Extraction are awesome with eldrazi/affinity decks, if I can exile Urza's Mine / Urza's Tower or something like Mycosynth Lattice my opponent can't play its game
At the beginning of your end step, create X 1/1 black Fungus creature tokens with "This token can't block," where X is the number of times you descended this turn
Finally, control decks will play more lands than most other decks