Delvefall
Charred Foyer // Warped Space

Charred Foyer // Warped Space {3}{R} // {4}{R}{R}

Enchantment — Room // Enchantment — Room

At the beginning of your upkeep, exile the top card of your library. You may play it this turn.
(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)
Once each turn, you may pay {0} rather than pay the mana cost for a spell you cast from exile.
(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)

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Cards that do something similar expected a card that isn't here?

Urabrask, Heretic Praetor
Urabrask, Heretic Praetor 100%
$1.56#4319
"At the beginning of your upkeep, exile the top card of your library. You may play it this turn."
Count on Luck
Count on Luck 100%
$0.51#4430
"At the beginning of your upkeep, exile the top card of your library. You may play that card this turn."
Visions of Phyrexia
Visions of Phyrexia 100%
$0.43#8536
"At the beginning of your upkeep, exile the top card of your library. You may play that card this turn."
Bell Borca, Spectral Sergeant
Bell Borca, Spectral Sergeant 100%
$0.18#16433
"At the beginning of your upkeep, exile the top card of your library. You may play that card this turn."
Theater of Horrors
Theater of Horrors 100%
$0.36#4434
"At the beginning of your upkeep, exile the top card of your library."
Vance's Blasting Cannons // Spitfire Bastion
Vance's Blasting Cannons // Spitfire Bastion 99%
$0.32#14469
"At the beginning of your upkeep, exile the top card of your library. If it's a nonland card, you may cast that card this turn."
Monk Class
Monk Class 98%
$0.39#9613
"At the beginning of your upkeep, exile the top card of your library. For as long as it remains exiled, it has "You may cast this card from exile as long as you've cast another spell this turn.""
+1 more matching line
Headliner Scarlett
Headliner Scarlett 91%
$5.64#8460
"At the beginning of your upkeep, exile the top card of your library face down. You may look at and play that card this turn."
Jacob Hauken, Inspector // Hauken's Insight
Jacob Hauken, Inspector // Hauken's Insight 91%
$0.46#11371
"At the beginning of your upkeep, exile the top card of your library face down. You may look at that card for as long as it remains exiled."
Tlincalli Hunter // Retrieve Prey
Tlincalli Hunter // Retrieve Prey 89%
$0.66#5886
"Once each turn, you may pay {0} rather than pay the mana cost for a creature spell you cast from exile."
Uvilda, Dean of Perfection // Nassari, Dean of Expression
Uvilda, Dean of Perfection // Nassari, Dean of Expression 89%
$0.25#16260
"At the beginning of your upkeep, exile the top card of each opponent's library. Until end of turn, you may cast spells from among those exiled cards, and you may spend mana as though it were mana of any color to cast those spells."
Stolen Strategy
Stolen Strategy 89%
$0.36#4419
"At the beginning of your upkeep, exile the top card of each opponent's library. Until end of turn, you may cast spells from among those exiled cards, and you may spend mana as though it were mana of any color to cast those spells."
Kyren Archive
Kyren Archive 87%
$0.37#28780
"At the beginning of your upkeep, you may exile the top card of your library face down."
Summoning Trap
Summoning Trap 82%
$0.47#17511
"If a creature spell you cast this turn was countered by a spell or ability an opponent controlled, you may pay {0} rather than pay this spell's mana cost."
Triple Triad
Triple Triad 81%
$0.39#5187
"At the beginning of your upkeep, each player exiles the top card of their library. Until end of turn, you may play the card you own exiled this way and each other card exiled this way with lesser mana value than it without paying their mana costs."
Timesifter
Timesifter 81%
$2.56#13249
"At the beginning of each upkeep, each player exiles the top card of their library. The player who exiled the card with the greatest mana value takes an extra turn after this one. If two or more players' cards are tied for greatest, the tied players repeat this process until the tie is broken."