Exile target creature you don't control. For each creature exiled this way, its controller searches their library for a basic land card. Those players put those cards onto the battlefield tapped, then shuffle their libraries.
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Quote from Faruel »the ramp component isn't a may effect. So Ankh of Mishra won't be an option. If your opponents are playing 3-5 colored decks, than they most likely only run few basics.