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Generally speaking, in decks that are three or more colors, you want to play almost all dual lands, along with enough basic lands to support whatever ramp is in your deck (Land Tax, Kodama's Reach, Rampant Growth, et al.)
Players can add as many as they want above that, but sticking close to 60 gives players a better chance to pull specific cards they want during a game
Mutate turns two or more creature cards into one permanent, merging their abilities, and usually granting a special benefit when you do so - but the specific wording of the rules generates many edge cases you need to be aware of
This means you can search for them from your library with fetchlands