draft
Was playing MH3 draft. Cast Abstruse Appropriation , exiling the Evolution Witness (giving me the ability to play it the next turn with any colored mana) with the intent on playing it the next turn. During my main phase I was unable to cast Evolution Witness, as it was asking for green mana despite Abstruse Appropriation's rules text, causing me to lose the draft the following turn.
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Doomnonius#29507 commented
This isn't a bug. Abstruse Appropriation says you can spend *colorless* mana as though it were mana of any color to cast the spell, not just any mana. So you need either colorless mana or the right color mana.