Atlantean Skirmisher 

Creature — Merfolk Rogue
$0.28 #24942 0.00 0.2 years
Whenever this creature attacks, it connives. (Draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on this creature.)
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Cards similar to Atlantean Skirmisher 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.
Scurrilous Sentry94%
$0.13↓#16093↑0.002.2 years↑
"Whenever this creature enters or attacks, it connives."
Tiger Shark, Abyssal Hunter92%
$0.23↓#245690.000.2 years
"Whenever this card enters or attacks, he connives."
Copycrook90%
$0.27↓#6076↑0.27↑2.2 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it has "Whenever this creature attacks, it connives.""
Raffine, Scheming Seer85%
$2.43↑#4888↑0.36↑4.4 years↑
"Whenever you attack, target attacking creature connives X, where X is the number of attacking creatures."
Illuminator Virtuoso85%
$0.23↓#16421↑0.27↑4.4 years↑
"Whenever this creature becomes the target of a spell you control, it connives."
Prowler, Clawed Thief84%
$0.17↓#7971↑0.27↑1.0 years
"Whenever another Villain you control enters, this card connives."
Swordsman, Sharp Scoundrel83%
$0.18↓#210100.000.2 years
"Whenever an equipped creature you control attacks, it connives."
Adventurer's Airship80%
$0.19↓#10821↑0.22↑1.2 years↑
"Whenever this Vehicle attacks, draw a card, then discard a card."
Stadium Tidalmage80%
$0.03↓#242150.000.4 years
"Whenever this creature enters or attacks, you may draw a card. If you do, discard a card."
Overwhelmed Archivist // Archive Haunt80%
$0.15↓#239300.12↑4.9 years↑
"Whenever this creature attacks, draw a card, then discard a card."