Knowledge Exploitation 
Kindred Sorcery — Rogue
$7.88 #12861 1.00 18.7 years
Prowl 
(You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Rogue.)
(You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Rogue.)Search target opponent's library for an instant or sorcery card. You may cast that card without paying its mana cost. Then that player shuffles.
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Cards similar to Knowledge Exploitation 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.
Thieves' Fortune86%
$0.26↓#20866↓0.06↓18.7 years
"Prowl You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Rogue."
You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Rogue."
Noggin Whack83%
$0.29↓#27055↓0.52↓18.7 years
"Prowl 
You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Rogue."
You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Rogue."
Morsel Theft82%
$0.22↓#27061↓0.00↓18.7 years
"Prowl You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Rogue."
You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Rogue."
Notorious Throng81%
$3.21↓#4307↑0.14↓18.7 years
"Prowl You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Rogue."
You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Rogue."
Latchkey Faerie81%
$0.10↓#18642↓0.19↓18.7 years
"Prowl 
You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Faerie or Rogue."
You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Faerie or Rogue."
Earwig Squad78%
$0.46↓#20236↓0.69↓18.7 years
"Prowl You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Goblin or Rogue."
You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Goblin or Rogue."
Stinkdrinker Bandit78%
$0.23↓#132130.05↓18.7 years
"Prowl You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Goblin or Rogue."
You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Goblin or Rogue."
Enigma Thief76%
$0.38↓#112790.06↓6.1 years↓
"Prowl You may cast this spell for its prowl cost if you dealt combat damage to a player this turn with a Sphinx or Rogue."
You may cast this spell for its prowl cost if you dealt combat damage to a player this turn with a Sphinx or Rogue."
Auntie's Snitch76%
$0.12↓#22645↓0.00↓18.7 years
"Prowl You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Goblin or Rogue."
You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Goblin or Rogue."
Solve the Equation74%
$3.58↓#938↑0.39↓5.5 years↓
"Search your library for an instant or sorcery card, reveal it, put it into your hand, then shuffle."
Mystical Tutor72%
$15.85↑#162↑1.16↑30.0 years↑
"Search your library for an instant or sorcery card, reveal it, then shuffle and put that card on top."