Epistolary Librarian 
Creature — Astartes Wizard
$0.37 #13934 0.00 3.9 years
Veil of Time — Whenever this creature attacks, you may cast a spell with mana value X or less from your hand without paying its mana cost, where X is the number of attacking creatures.
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Cards similar to Epistolary Librarian 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.
Sram's Expertise86%
$0.77↑#6907↑0.19↑9.6 years↑
"You may cast a spell with mana value 3 or less from your hand without paying its mana cost."
Yahenni's Expertise86%
$0.42↑#8612↑0.44↑9.6 years↑
"You may cast a spell with mana value 3 or less from your hand without paying its mana cost."
Rishkar's Expertise82%
$3.59↑#243↑0.42↑9.6 years↑
"You may cast a spell with mana value 5 or less from your hand without paying its mana cost."
Baral's Expertise82%
$0.24↓#3807↑0.47↑9.6 years↑
"You may cast a spell with mana value 4 or less from your hand without paying its mana cost."
Kari Zev's Expertise76%
$1.34↑#6844↑0.059.6 years↑
"You may cast a spell with mana value 2 or less from your hand without paying its mana cost."
Lady Octopus, Inspired Inventor74%
$0.77↑#5514↑0.63↑1.0 years↓
"
: You may cast an artifact spell from your hand with mana value less than or equal to the number of ingenuity counters on this card without paying its mana cost."
: You may cast an artifact spell from your hand with mana value less than or equal to the number of ingenuity counters on this card without paying its mana cost."
Yennett, Cryptic Sovereign72%
$0.37#11069↑0.27↑8.1 years↑
"Whenever this card attacks, reveal the top card of your library. You may cast it without paying its mana cost if its mana value is odd. If you don't cast it, draw a card."
Kinscaer Sentry70%
$0.36↓#7654↑0.000.6 years↓
"Whenever this creature attacks, you may put a creature card with mana value X or less from your hand onto the battlefield tapped and attacking, where X is the number of attacking creatures you control."
Aisha of Sparks and Smoke70%
$0.62↑#165280.43↑4.5 years
"Whenever Aisha deals combat damage, you may cast a sorcery spell from your hand with mana value less than or equal to that damage without paying its mana cost."
Omniscience70%
$6.14↑#1022↑1.72↑14.1 years↑
"You may cast spells from your hand without paying their mana costs."
Marvo, Deep Operative70%
$0.61↑#7434↑0.13↑2.6 years↓
"Whenever you win a clash, draw a card. Then you may cast a spell from your hand with mana value 8 or less without paying its mana cost."