This spell costs less to cast for each land your opponents control that could produce .
Flying
When Obsidian Charmaw enters, destroy target nonbasic land an opponent controls.
Obsidian Charmaw's first ability counts each land your opponents control that would produce {C} if one of that land's abilities resolved. It doesn't matter whether that land's controller could currently activate the ability or not.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.
less to cast for each land your opponents control that could produce 
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Lucas Graciano2021-06-18
