Kethis, the Hidden Hand 
Legendary Creature — Elf Advisor
$3.67 #7513 0.33 7.3 years
Legendary spells you cast cost 
less to cast.
less to cast.Exile two legendary cards from your graveyard: Until end of turn, each legendary card in your graveyard gains "You may play this card from your graveyard."
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Cards similar to Kethis, the Hidden Hand 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.
Serah Farron // Crystallized Serah88%
$0.39↓#5366↑0.291.4 years↓
"The first legendary creature spell you cast each turn costs 
less to cast."
less to cast."
The Kenriths' Royal Funeral78%
$0.26↓#9551↓0.50↑3.4 years↓
"Legendary spells you cast cost less to cast for each card exiled with this card."
less to cast for each card exiled with this card."+1 more matching line
Magus of the Will76%
$0.31↓#17393↓0.299.9 years↑
", 
, Exile this creature: Until end of turn, you may play lands and cast spells from your graveyard. If a card would be put into your graveyard from anywhere this turn, exile that card instead."
, , Exile this creature: Until end of turn, you may play lands and cast spells from your graveyard. If a card would be put into your graveyard from anywhere this turn, exile that card instead."
Yawgmoth's Will72%
$245.32↑#2632↑1.28↑28.0 years↑
"Until end of turn, you may play lands and cast spells from your graveyard."
Emet-Selch, Unsundered // Hades, Sorcerer of Eld70%
$1.92↓#62240.381.4 years↓
"During your turn, you may play cards from your graveyard."