Villainous Wealth

You choose which spells (if any) to cast as Villainous Wealth resolves. If you do, you do so as part of the resolution of Villainous Wealth. You can't wait to cast them later in the turn.

If a spell you cast has X generic mana in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.

If you cast a spell "without paying its mana cost," you can't choose to cast it for any alternative costs. You can, however, pay additional costs, such as kicker costs. If the spell has any mandatory additional costs, those must be paid to cast the spell.