Jeleva, Nephalia's Scourge 
Legendary Creature — Vampire Wizard
$2.41 #14185 0.59 12.8 years
Flying
When Jeleva enters, each player exiles the top X cards of their library, where X is the amount of mana spent to cast Jeleva.
Whenever Jeleva attacks, you may cast an instant or sorcery spell from among cards exiled with Jeleva without paying its mana cost.
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Cards similar to Jeleva, Nephalia's Scourge 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.
Etali, Primal Storm84%
$0.44↓#266↑0.85↑8.6 years↓
"Whenever this card attacks, exile the top card of each player's library, then you may cast any number of spells from among those cards without paying their mana costs."
Wings of the Guard80%
$0.14↓#23912↓0.20↓10.0 years↓
"Flying"
Dazzling Sphinx79%
$0.37↓#6415↑0.535.4 years↓
"Whenever this creature deals combat damage to a player, that player exiles cards from the top of their library until they exile an instant or sorcery card. You may cast that card without paying its mana cost. Then that player puts the exiled cards that weren't cast this way on the bottom of their library in a random order."
Chaos Wand79%
$0.25↓#4248↑0.27↓8.1 years↓
"
, 
: Target opponent exiles cards from the top of their library until they exile an instant or sorcery card. You may cast that card without paying its mana cost. Then put the exiled cards that weren't cast this way on the bottom of that library in a random order."
, : Target opponent exiles cards from the top of their library until they exile an instant or sorcery card. You may cast that card without paying its mana cost. Then put the exiled cards that weren't cast this way on the bottom of that library in a random order."
Lord of the Void79%
$7.15↑#3355↑0.6913.6 years
"Flying"
Strago and Relm78%
$0.25↓#9122↑0.44↓1.2 years↓
"
, : Target opponent exiles cards from the top of their library until they exile an instant, sorcery, or creature card. You may cast that card without paying its mana cost. If you cast a creature spell this way, it gains haste and "At the beginning of the end step, sacrifice this creature." Activate only as a sorcery."
, : Target opponent exiles cards from the top of their library until they exile an instant, sorcery, or creature card. You may cast that card without paying its mana cost. If you cast a creature spell this way, it gains haste and "At the beginning of the end step, sacrifice this creature." Activate only as a sorcery."
Gríma, Saruman's Footman78%
$1.60↓#3164↑0.36↓3.2 years↓
"Whenever this card deals combat damage to a player, that player exiles cards from the top of their library until they exile an instant or sorcery card. You may cast that card without paying its mana cost. Then that player puts the exiled cards that weren't cast this way on the bottom of their library in a random order."
Surtland Elementalist77%
$0.24↓#17279↓0.07↓5.6 years↓
"Whenever this creature attacks, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Knowledge Pool76%
$1.08↓#6759↑1.14↑15.6 years↑
"When this artifact enters, each player exiles the top three cards of their library."
Pteramander75%
$0.21↓#160450.00↓7.6 years↓
"Flying"
Goliath Daydreamer74%
$0.28↓#9800↑0.00↓0.6 years↓
"Whenever this creature attacks, you may cast a spell from among cards you own in exile with dream counters on them without paying its mana cost."
Gonti, Lord of Luxury74%
$0.28↓#2046↑0.559.9 years↓
"When this card enters, look at the top four cards of target opponent's library, exile one of them face down, then put the rest on the bottom of that library in a random order. You may cast that card for as long as it remains exiled, and mana of any type can be spent to cast that spell."
Diviner of Mist74%
$0.28↓#8659↑0.21↓1.4 years↓
"Whenever this creature attacks, mill four cards. You may cast an instant or sorcery spell from your graveyard with mana value 4 or less without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Zaffai and the Tempests74%
$0.23↓#126930.00↓0.4 years↓
"Once during each of your turns, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Etali, Primal Conqueror // Etali, Primal Sickness74%
$25.50↑#799↑1.65↑3.4 years↓
"When this card enters, each player exiles cards from the top of their library until they exile a nonland card. You may cast any number of spells from among the nonland cards exiled this way without paying their mana costs."
Talent of the Telepath74%
$0.65↓#10314↑0.6511.1 years↓
"If there are two or more instant and/or sorcery cards in your graveyard, you may cast up to two instant and/or sorcery spells from among the revealed cards instead of one."
The Dawning Archaic73%
$1.19↓#8544↑0.00↓0.4 years↓
"Whenever this card attacks, you may cast target instant or sorcery card from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Lidless Gaze73%
$0.29↓#118790.06↓3.2 years↓
"Exile the top card of each player's library. Until the end of your next turn, you may play those cards, and mana of any type can be spent to cast those spells."
+1 more matching line
Lobelia, Defender of Bag End73%
$0.28↓#7238↑0.543.2 years↓
"When this card enters, look at the top card of each opponent's library and exile those cards face down."
+1 more matching line
Wrexial, the Risen Deep73%
$1.50↓#5308↑0.47↓16.6 years↑
"Whenever this card deals combat damage to a player, you may cast target instant or sorcery card from that player's graveyard without paying its mana cost. If that spell would be put into a graveyard, exile it instead."