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Players usually can only play one land card per turn, with most land providing a specific color of mana when they are "tapped", usually by rotating the card 90 degrees to show it has been used that turn

Simply reducing the power of multicolored lands actually set up decks like 4c Omnath to be more powerful, since they run the ramp and fixing to power onwards while aggro decks crumble without untapped dual lands

We can just use some of our favorite spells and abilities to get opponents to show us the goods and reveal their hands

Thriving Heath

Along similar lines to the above strategy, cards like Goro-Goro and Satoru and Ojer Kaslem, Deepest Growth with triggers when dealing combat damage to a player can greatly benefit from additional combat phases