Djinn of Wishes

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 card has any mandatory additional costs, such as that of Tormenting Voice, those must be paid to cast the card.

If a spell 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 the revealed card is a land, you can play it only if it's your turn and you haven't yet played a land this turn.