Uba Mask 
Artifact
$9.49 #9289 0.92 21.9 years
If a player would draw a card, that player exiles that card face up instead.
Each player may play lands and cast spells from among cards they exiled with this artifact this turn.
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Cards similar to Uba Mask 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.
Urabrask, Heretic Praetor80%
$1.37↓#4386↑0.55↓4.4 years↓
"At the beginning of each opponent's upkeep, the next time they would draw a card this turn, instead they exile the top card of their library. They may play it this turn."
Shared Fate78%
$0.53↓#15347↓0.60↓22.9 years
"Each player may look at cards they exiled with this enchantment, and they may play lands and cast spells from among those cards."
+1 more matching line
Eruth, Tormented Prophet76%
$0.38↓#6246↑0.12↓4.8 years↓
"If you would draw a card, exile the top two cards of your library instead. You may play those cards this turn."
Ian Malcolm, Chaotician76%
$6.35↓#11152↓0.47↓2.8 years↓
"Whenever a player draws their second card each turn, that player exiles the top card of their library."
+1 more matching line
Notion Thief76%
$1.63↓#1191↑1.96↑13.3 years↓
"If an opponent would draw a card except the first one they draw in each of their draw steps, instead that player skips that draw and you draw a card."
Alms Collector73%
$1.24↓#4119↑0.58↓9.0 years↓
"If an opponent would draw two or more cards, instead you and that player each draw a card."
Possessed Portal72%
$2.75↓#17237↓1.56↑22.3 years
"If a player would draw a card, that player skips that draw instead."
Plagiarize71%
$0.39↓#20075↓0.73↓24.6 years↑
"Until end of turn, if target player would draw a card, instead that player skips that draw and you draw a card."
Theater of Horrors70%
$0.17↓#4581↑0.14↓7.6 years↓
"During your turn, if an opponent lost life this turn, you may play lands and cast spells from among cards exiled with this enchantment."
Breathstealer's Crypt70%
$11.13↑#15190↓1.07↑29.6 years↑
"If a player would draw a card, instead they draw a card and reveal it. If it's a creature card, that player discards it unless they pay 3 life."