Gonti, Canny Acquisitor {2}{B}{G}{U}
Legendary Creature — Aetherborn Rogue
Spells you cast but don't own cost {1} less to cast.
Whenever one or more creatures you control deal combat damage to a player, look at the top card of that player's library, then exile it face down. You may play that card for as long as it remains exiled, and mana of any type can be spent to cast 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.
Klaw, Master of Sound 90%
$0.30#20623
"Whenever this card deals combat damage to a player, look at the top card of that player's library, then exile it face down. You may play it for as long as it remains exiled. Mana of any type can be spent to cast a spell this way."
Rogue Class 90%
$1.58#5453
"Whenever a creature you control deals combat damage to a player, exile the top card of that player's library face down. You may look at it for as long as it remains exiled."
Locket of Yesterdays 89%
$2.30#7553
"Spells you cast cost {1} less to cast for each card with the same name as that spell in your graveyard."
Gonti, Night Minister 88%
$1.25#2622
"Whenever a creature deals combat damage to one of your opponents, its controller looks at the top card of that opponent's library and exiles it face down. They may play that card for as long as it remains exiled. Mana of any type can be spent to cast a spell this way."
Norman Osborn // Green Goblin 88%
$18.99#5662
"Spells you cast from your graveyard cost {2} less to cast."
Emet-Selch of the Third Seat 88%
$0.34#3271
"Spells you cast from your graveyard cost {2} less to cast."
Savvy Trader 87%
$3.81#4184
"Spells you cast from anywhere other than your hand cost {1} less to cast."
Cunning Nightbonder 87%
$0.30#10243
"Spells with flash you cast cost {1} less to cast and can't be countered."
Edward Kenway 85%
$5.86#5246
"Whenever a Vehicle you control deals combat damage to a player, look at the top card of that player's library, then exile it face down. You may play that card for as long as it remains exiled."
Breaking Wave 85%
$0.70#21927
"You may cast this spell as though it had flash if you pay {2} more to cast it."
Rout 85%
$0.41#7784
"You may cast this spell as though it had flash if you pay {2} more to cast it."