Research the Deep 
Sorcery
$0.37 #12080 0.71 18.6 years
Draw a card. Clash with an opponent. If you win, return Research the Deep to its owner's hand. (Each clashing player reveals the top card of their library, then puts that card on their choice of the top or bottom. A player wins if their card had a greater mana value.)
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Cards similar to Research the Deep 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.
Revive the Fallen88%
$0.35↓#123580.05↓18.6 years
"Return target creature card from a graveyard to its owner's hand. Clash with an opponent. If you win, return this card to its owner's hand."
Release the Ants88%
$0.15↓#27107↓0.24↓18.6 years
"this card deals 1 damage to any target. Clash with an opponent. If you win, return this card to its owner's hand."
Titan's Revenge87%
$0.29↓#26329↓0.06↓18.6 years
"this card deals X damage to any target. Clash with an opponent. If you win, return this card to its owner's hand."
Hoarder's Greed85%
$0.30↓#99840.31↓18.9 years
"You lose 2 life and draw two cards, then clash with an opponent. If you win, repeat this process."
Oaken Brawler82%
$0.23↓#28241↓0.25↓18.9 years
"When this creature enters, clash with an opponent. If you win, put a +1/+1 counter on this creature."
Adder-Staff Boggart82%
$0.16↓#26701↓0.18↓18.9 years
"When this creature enters, clash with an opponent. If you win, put a +1/+1 counter on this creature."
Paperfin Rascal82%
$0.26↓#16605↓0.47↓18.9 years
"When this creature enters, clash with an opponent. If you win, put a +1/+1 counter on this creature."
Bog Hoodlums82%
$0.09↓#21595↓0.00↓18.9 years
"When this creature enters, clash with an opponent. If you win, put a +1/+1 counter on this creature."
Petals of Insight82%
$0.16↓#22804↓0.00↓21.9 years↑
"Look at the top three cards of your library. You may put those cards on the bottom of your library in any order. If you do, return this card to its owner's hand. Otherwise, draw three cards."
Ringskipper81%
$0.27↓#15184↓0.21↓18.9 years
"When this creature dies, clash with an opponent. If you win, return this card to its owner's hand."
Recross the Paths81%
$0.17↓#16095↓0.24↓18.6 years
"Reveal cards from the top of your library until you reveal a land card. Put that card onto the battlefield and the rest on the bottom of your library in any order. Clash with an opponent. If you win, return this card to its owner's hand."
Redeem the Lost80%
$0.15↓#24835↓0.16↓18.6 years
"Target creature you control gains protection from the color of your choice until end of turn. Clash with an opponent. If you win, return this card to its owner's hand."
Lash Out78%
$0.13↓#27414↓0.05↓18.9 years
"this card deals 3 damage to target creature. Clash with an opponent. If you win, this card deals 3 damage to that creature's controller."
Nath's Elite76%
$0.08↓#25535↓0.25↓18.9 years
"When this creature enters, clash with an opponent. If you win, put a +1/+1 counter on this creature."
Pulling Teeth76%
$0.12↓#14714↓0.25↓18.6 years
"Clash with an opponent. If you win, target player discards two cards. Otherwise, that player discards a card."
Whirlpool Whelm75%
$0.15↓#128930.06↓18.9 years
"Clash with an opponent, then return target creature to its owner's hand. If you win, you may put that creature on top of its owner's library instead."
Spring Cleaning74%
$0.31↓#19308↓0.24↓18.9 years
"Destroy target enchantment. Clash with an opponent. If you win, destroy all enchantments your opponents control."
Sentry Oak72%
$0.18↓#29584↓0.00↓18.9 years
"At the beginning of combat on your turn, you may clash with an opponent. If you win, this creature gets +2/+0 and loses defender until end of turn."
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."