Atlantean Skirmisher 
Creature — Merfolk Rogue
$0.26 #24329 0.12 0.3 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.
Doc Ock's Henchmen100%
$0.16↓#13496↑0.56↑1.1 years
"Whenever this creature attacks, it connives."
Kang, Temporal Tyrant96%
$0.18↓#9534↑0.150.3 years
"Whenever this card attacks, he connives."
Ultron, Unlimited95%
$1.03↑#8630↑0.45↑0.3 years
"Whenever this card attacks, he connives."
Scurrilous Sentry94%
$0.11↓#16418↑0.00↓2.3 years↑
"Whenever this creature enters or attacks, it connives."
Tiger Shark, Abyssal Hunter92%
$0.26#239750.200.3 years
"Whenever this card enters or attacks, he connives."
Copycrook90%
$0.31↑#5982↑0.212.3 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 Seer86%
$3.91↑#4474↑0.37↑4.5 years↑
"Whenever you attack, target attacking creature connives X, where X is the number of attacking creatures."
Hypnotic Grifter86%
$0.23↓#225940.124.5 years↑
"
: This creature connives."
: This creature connives."
Illuminator Virtuoso85%
$0.21↓#16668↑0.064.5 years↑
"Whenever this creature becomes the target of a spell you control, it connives."
Swordsman, Sharp Scoundrel84%
$0.11↓#201170.110.3 years
"Whenever an equipped creature you control attacks, it connives."
Raffine's Informant84%
$0.25↓#210460.00↓4.5 years↑
"When this creature enters, it connives."
Psionic Snoop84%
$0.10↓#260220.27↑4.5 years↑
"When this creature enters, it connives."
Red Room Recruit84%
$0.13↓#19330↑0.120.3 years
"When this creature enters, it connives."
Echo Inspector84%
$0.06↓#240550.00↓4.5 years↑
"When this creature enters, it connives."
Revel Ruiner84%
$0.04↓#251920.00↓4.5 years↑
"When this creature enters, it connives."
Prowler, Clawed Thief83%
$0.21↓#7387↑0.82↑1.1 years
"Whenever another Villain you control enters, this card connives."
Namor, Scourge of the Seas81%
$0.89↑#17874↑0.39↑0.3 years
"At the beginning of combat on your turn, target creature you control connives."
Adventurer's Airship80%
$0.21↓#10652↑0.071.4 years↑
"Whenever this Vehicle attacks, draw a card, then discard a card."
Stadium Tidalmage80%
$0.07↓#239580.01↓0.5 years
"Whenever this creature enters or attacks, you may draw a card. If you do, discard a card."
Furtive Courier79%
$0.04↓#269720.062.7 years↑
"Whenever this creature attacks, draw a card, then discard a card."