Dream Halls {3}{U}{U}
Enchantment
Rather than pay the mana cost for a spell, its controller may discard a card that shares a color with that spell.
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Cards that do something similar expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Obscuring Haze 89%
$4.56#1513
"If you control a commander, you may cast this spell without paying its mana cost."
Fierce Guardianship 89%
$55.03#80
"If you control a commander, you may cast this spell without paying its mana cost."
Deflecting Swat 89%
$65.28#77
"If you control a commander, you may cast this spell without paying its mana cost."
Flawless Maneuver 89%
$20.35#184
"If you control a commander, you may cast this spell without paying its mana cost."
Deadly Rollick 89%
$28.15#112
"If you control a commander, you may cast this spell without paying its mana cost."
Tamiyo, Collector of Tales 84%
$0.25#8229
"Spells and abilities your opponents control can't cause you to discard cards or sacrifice permanents."
Once Upon a Time 82%
$1.45#8818
"If this spell is the first spell you've cast this game, you may cast it without paying its mana cost."
Dragon Man, Reformed Robot 81%
$0.19#26598
"You may cast this card from your graveyard by discarding a card in addition to paying its other costs."
Alien Symbiosis 81%
$0.36#11657
"You may cast this card from your graveyard by discarding a card in addition to paying its other costs."
Ancestral Communion 81%
$0.45#19493
"When you cast this spell while you control your commander, copy this spell. You may choose a new target for the copy."
Rona, Sheoldred's Faithful 80%
$0.10#13094
"You may cast this card from your graveyard by discarding two cards in addition to paying its other costs."