Villanous Wealth
I think I ran into a bug trying to play Villainous Wealth. I cast Villainous Wealth and from my opponents deck, I had could cast the Explosive Derailment. Except when I went to go choose the mode to play the spell, it would not let me cast the spell because it said I did not have the mana. But Villainous Wealth is supposed to let me cast the spell for free. It would not let me cast either of the modes, weather to just do the 4 damage for 3 mana or to just destroy an artifact for 5 mana. I cast using 8 mana, so I should have been able to cast just the 3 mana, but it would not let me.
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Rezzahan#77802 commented
The mana cost is ONLY what's printed in the upper right corner of the card. The costs for Explosive Derailment's modes are ADDITIONAL costs, which you have to pay even if casting a spell without paying the mana cost. So no, Villainous Wealth does not let you cast spells for free, only without paying the mana cost, which may or may not be the entire cost of a spell depending on the spell. (Additional note: any X cost spells must have X=0 if cast withpout paying the mana cost.)