Charred Foyer
Enchantment — Room
At the beginning of your upkeep, exile the top card of your library. You may play it this turn.
Warped Space
Enchantment — Room
Once each turn, you may pay 
rather than pay the mana cost for a spell you cast from exile.
Andrew Mar
Rulings
If you cast a spell for an alternative cost of {0}, you can't pay any other alternative costs. You can, however, pay additional costs, such as kicker. If the card has any mandatory additional costs, you must pay those.
(wotc • 2024-09-20)
You pay all costs and follow all timing rules for cards played with the permission granted by Charred Foyer's ability. For example, if the exiled card is a land card, you may play it only during your main phase while the stack is empty.
(wotc • 2024-09-20)
Rulings
If you cast a spell for an alternative cost of {0}, you can't pay any other alternative costs. You can, however, pay additional costs, such as kicker. If the card has any mandatory additional costs, you must pay those.
(wotc • 2024-09-20)
You pay all costs and follow all timing rules for cards played with the permission granted by Charred Foyer's ability. For example, if the exiled card is a land card, you may play it only during your main phase while the stack is empty.
(wotc • 2024-09-20)