Synth Eradicator {2}{R}
Artifact Creature — Synth Soldier
Haste
Whenever this creature attacks, exile the top card of your library. You may get {E}{E} (two energy counters). If you don't, you may play that card this turn.
{T}, Pay {E}{E}{E}: This creature deals 3 damage to any target.
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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.
Caves of Chaos Adventurer 99%
$0.44#7374
"Whenever this creature attacks, exile the top card of your library. If you've completed a dungeon, you may play that card this turn without paying its mana cost. Otherwise, you may play that card this turn."
Mezzio Mugger 94%
$0.32#12165
"Whenever this creature attacks, exile the top card of each player's library. You may play those cards this turn, and you may spend mana as though it were mana of any color to cast those spells."
Bomat Courier 93%
$0.22#12903
"Whenever this creature attacks, exile the top card of your library face down."
+1 more matching line
Robber of the Rich 91%
$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."
Gila Courser 90%
$0.17#15641
"Whenever this creature attacks while saddled, exile the top card of your library. Until the end of your next turn, you may play that card."
Bioplasm 89%
$0.30#25170
"Whenever this creature attacks, exile the top card of your library. If it's a creature card, this creature gets +X/+Y until end of turn, where X is the exiled creature card's power and Y is its toughness."
Daredevil, Fearless Fighter 87%
$3.56#19255
"Whenever this card attacks, exile the top card of your library. this card deals damage to you equal to that card's mana value. You may play it this turn."
Laelia, the Blade Reforged 87%
$0.30#1297
"Whenever this card attacks, exile the top card of your library. You may play that card this turn."
+1 more matching line
Nathan Drake, Treasure Hunter 86%
$4.72#14996
"Whenever this card attacks, exile the top card of each player's library. You may cast a spell from among those cards."
Tempered in Solitude 86%
$0.26#12038
"Whenever a creature you control attacks alone, exile the top card of your library. You may play that card this turn."
Boros Strike-Captain 84%
$0.37#19342
"Whenever this creature and at least two other creatures attack, exile the top card of your library. During any turn you attacked with three or more creatures, you may play that card."
Connecting the Dots 83%
$0.28#9758
"Whenever a creature you control attacks, exile the top card of your library face down."
Etali, Primal Storm 83%
$0.43#260
"Whenever this card attacks, exile the top card of each player's library, then you may cast any number of spells from among those cards without paying their mana costs."
Kami of Celebration 82%
$1.00#6590
"Whenever a modified creature you control attacks, exile the top card of your library. You may play that card this turn."
Innocuous Researcher 82%
$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."
Storm Fleet Negotiator 80%
$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."