Knowledge Exploitation 
Kindred Sorcery — Rogue
$7.90 #12661 0.70 18.6 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' Fortune84%
$0.26↓#20437↓0.22↓18.6 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 Whack82%
$0.27↓#26857↓0.39↓18.6 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%
$0.19↓#26871↓0.27↓18.6 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 Throng80%
$3.52↓#4233↑0.51↓18.6 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 Faerie80%
$0.12↓#18285↓0.00↓18.6 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 Squad77%
$0.44↓#19908↓0.57↓18.6 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 Bandit77%
$0.19↓#129440.00↓18.6 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%
$0.33↓#124020.25↓5.9 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%
$0.11↓#22292↓0.00↓18.6 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%
$3.53↓#933↑0.51↓5.4 years↓
"Search your library for an instant or sorcery card, reveal it, put it into your hand, then shuffle."
Mystical Tutor73%
$16.60↑#160↑1.20↑29.9 years↑
"Search your library for an instant or sorcery card, reveal it, then shuffle and put that card on top."
Reversal of Fortune70%
$3.75↓#21041↓0.45↓22.3 years↑
"Target opponent reveals their hand. You may copy an instant or sorcery card in it. If you do, you may cast the copy without paying its mana cost."
Talent of the Telepath70%
$0.65↓#103140.6511.1 years↓
"Target opponent reveals the top seven cards of their library. You may cast an instant or sorcery spell from among them without paying its mana cost. Then that player puts the rest into their graveyard."