Dual coloured lands are usually uncommon at least. As noted, Tarkir and Ravnica are special cases with special needs for draft, where you need the colourfixing more often than in Innistrad. Look at cards like Coastal Tower or Lantern-Lit Graveyard for examples of how it used to be. The original refuges (Akoum Refuge and pals) were also uncommon.
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My Commander decks:
Chandra, Torch of Defiance - Oops! All Chandras.
Prime Speaker Zegana - Draw for Power.
Pir & Toothy - Counterpalooza.
Arcades, the Strategist - Another Brick in the Wall.
Zacama, Primal Calamity - Calamity of Double Mana.
Edgar Markov - Vampires Don't Die.
Child of Alara - Dreamcrusher.
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Chandra, Torch of Defiance - Oops! All Chandras.
Prime Speaker Zegana - Draw for Power.
Pir & Toothy - Counterpalooza.
Arcades, the Strategist - Another Brick in the Wall.
Zacama, Primal Calamity - Calamity of Double Mana.
Edgar Markov - Vampires Don't Die.
Child of Alara - Dreamcrusher.