Mightstone+Weakstone paying for nonartifact spells
I played a Make Disappear, which is a blue spell that counters target spell unless opponent pays 2 colorless. My opponent tapped mightstone for colorless mana but the description of the mana add says "This mana can't be spent to cast nonartifact spells." The mana required to activate Make Disappear's built in counter is definitely not an artifact spell, so Mightstone's mana should not be valid in this situation. Thanks for your time!
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[Deleted User] commented
He's not casting a spell, he's paying a tax asked for by YOUR spell. Mightstone+Weakstone's mana can be used for that.