Skyswimmer Koi 
Creature — Fish
$0.17 #17188 0.36 4.5 years
Flying
Whenever an artifact you control enters, you may draw a card. If you do, discard a card.
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Cards similar to Skyswimmer Koi 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.
Rook Turret100%
$0.19↑#8505↑0.11↓1.2 years↓
"Whenever another artifact you control enters, you may draw a card. If you do, discard a card."
Transplant Theorist94%
$0.20↑#9723↑0.413.6 years
"Whenever this creature or another artifact you control enters, you may draw a card. If you do, discard a card."
Fateful Discovery88%
$5.99↑#13444↑0.00↓0.1 years↓
"Whenever an artifact you control enters, draw a card."
Spellbound Dragon88%
$0.34↑#20768↓0.61↑17.3 years↑
"Flying"
Quicksmith Genius87%
$0.28↑#8166↑0.19↓9.9 years↑
"Whenever an artifact you control enters, you may discard a card. If you do, draw a card."
Riddlesmith85%
$0.19↑#5538↑0.21↓15.9 years↑
"Whenever you cast an artifact spell, you may draw a card. If you do, discard a card."
Talion's Messenger82%
$0.27↑#9595↑0.06↓3.0 years↓
"Flying"
Donatello, Way with Machines80%
$0.21↑#13634↑0.00↓0.5 years↓
"Whenever an artifact you control enters, put a +1/+1 counter on this card."
+1 more matching line
Shoal Kraken79%
$0.12↓#22489↓0.00↓6.6 years↑
"Whenever an enchantment you control enters, you may draw a card. If you do, discard a card."
Towashi Songshaper79%
$0.10↓#25896↓0.00↓4.5 years
"Whenever another artifact you control enters, this creature gets +1/+0 until end of turn."
Perimeter Patrol79%
$0.04↓#30426↓0.00↓3.8 years
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Phalanx Vanguard79%
$0.04↓#27045↓0.273.8 years
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Glaze Fiend78%
$0.17#24361↓0.00↓17.9 years↑
"Whenever another artifact you control enters, this creature gets +2/+2 until end of turn."
+1 more matching line
Machinesmith Automaton78%
$0.17#178960.00↓0.2 years↓
"Whenever another artifact you control enters, put a +1/+1 counter on this creature."
Cloudsculpt Technician78%
$0.04↓#24549↓0.14↓1.1 years↓
"Flying"
Moon Girl and Devil Dinosaur77%
$0.23↑#20683↓0.00↓0.2 years↓
"Whenever an artifact you control enters, draw a card. This ability triggers only once each turn."
Iron Man, Master of Machines76%
$0.25↑#12372↑0.00↓0.2 years↓
"Whenever this card attacks, if an artifact entered the battlefield under your control this turn, draw a card."
Stadium Tidalmage76%
$0.03↓#24215↓0.00↓0.4 years↓
"Whenever this creature enters or attacks, you may draw a card. If you do, discard a card."
Oreplate Pangolin76%
$0.14↓#165970.12↓1.1 years↓
"Whenever another artifact you control enters, you may pay 
. If you do, put a +1/+1 counter on this creature."
. If you do, put a +1/+1 counter on this creature."
Thought Courier76%
$0.18↑#10335↑0.10↓22.3 years↑
"
: Draw a card, then discard a card."
: Draw a card, then discard a card."