Cards exiled are always exiled face up unless specified otherwise by the effect that exiled it.
2021-04-16 • wotc
If you choose to play the exiled card this turn, you must still pay all costs and follow all timing restrictions required by that card. If it's a land, you can't play it unless you have a land play available.
2021-04-16 • wotc
If you don't play the exiled card, it remains exiled. It won't be available to be played on future turns.
2021-04-16 • wotc