Mastery of the Force

At the beginning of your precombat main phase,
look at the top card of your library. You may
reveal that card if it has three or more colored mana
symbols in its mana cost. If you do, add three mana
in any combination of its colors and put it into your
hand. If you don't reveal it, put it into your hand.

Lands you control have "{t}: Add {1} mana of any color."