Nicol Bolas, God-Pharaoh

The cards exiled by Nicol Bolas's first and second abilities are exiled face up.

You may cast the nonland card exiled by Nicol Bolas's first ability that turn even if Nicol Bolas is no longer on the battlefield or under your control.

If you don't cast the card exiled by Nicol Bolas's first ability that turn, it will remain exiled.

If you cast a card "without paying its mana cost," you can't choose to cast it for any alternative costs, such as emerge costs. You can, however, pay additional costs. If the card has any mandatory additional costs, such as that of Tormenting Voice, you must pay those to cast the card.