Conundrum Sphinx 


Creature — Sphinx
Flying
Whenever this creature attacks, each player chooses a card name. Then each player reveals the top card of their library. If the card a player revealed has the name they chose, that player puts it into their hand. If it doesn't, that player puts it on the bottom of their library.
click a line to search just that ability, click more to combine them
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.
Innocuous Researcher 89%
$0.26#12932
"Whenever this creature attacks, each player reveals the top card of their library. For each nonland card revealed this way, you investigate. Then each player draws a card."
Goblin Guide 88%
$1.25#14644
"Whenever this creature attacks, defending player reveals the top card of their library. If it's a land card, that player puts it into their hand."
Cheering Fanatic 87%
$0.27#19397
"Whenever this creature attacks, choose a card name. Spells with the chosen name cost {1} less to cast this turn."
Storm Fleet Negotiator 86%
$0.23#8920
"Whenever this creature attacks, each player reveals the top card of their library. For each nonland card revealed this way, you create a Map token. Then each player draws a card."
Xantid Swarm 84%
$3.88#13727
"Whenever this creature attacks, defending player can't cast spells this turn."
Cutthroat Negotiator 83%
$0.37#10068
"Whenever this creature attacks, each player reveals the top card of their library. For each nonland card revealed this way, you create a tapped Treasure token. Then each player draws a card."
Robber of the Rich 82%
$1.52#10249
"Whenever this creature attacks, if defending player has more cards in hand than you, exile the top card of their library. During any turn you attacked with a Rogue, you may cast that card and you may spend mana as though it were mana of any color to cast that spell."
Smirking Spelljacker 82%
$2.79#6873
"Whenever this creature attacks, if a card is exiled with it, you may cast the exiled card without paying its mana cost."
Mardu Siegebreaker 81%
$0.46#3889
"Whenever this creature attacks, for each opponent, create a tapped token that's a copy of the exiled card attacking that opponent. At the beginning of your next end step, sacrifice those tokens."
Gaea's Courser 80%
$0.04#24471
"Whenever this creature attacks, if there are three or more creature cards in your graveyard, draw a card."
Stromgald Spy 80%
$0.15#29721
"Whenever this creature attacks and isn't blocked, you may have defending player play with their hand revealed for as long as this creature remains on the battlefield. If you do, this creature assigns no combat damage this turn."