Rook Turret 
Artifact Creature — Construct
$0.19 #8505 0.11 1.2 years
Flying
Whenever another artifact you control enters, you may draw a card. If you do, discard a card.
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Cards similar to Rook Turret 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.
Skyswimmer Koi100%
$0.17↓#17188↓0.36↑4.5 years↑
"Whenever an artifact you control enters, you may draw a card. If you do, discard a card."
Transplant Theorist94%
$0.20↑#97230.41↑3.6 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↑#81660.199.9 years↑
"Whenever an artifact you control enters, you may discard a card. If you do, draw a card."
Riddlesmith86%
$0.19#5538↑0.2115.9 years↑
"Whenever you cast an artifact spell, you may draw a card. If you do, discard a card."
Talion's Messenger82%
$0.27↑#95950.063.0 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
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↓0.27↑3.8 years↑
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Shoal Kraken78%
$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."
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↓#17896↓0.00↓0.2 years↓
"Whenever another artifact you control enters, put a +1/+1 counter on this creature."
Cloudsculpt Technician78%
$0.04↓#24549↓0.141.1 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↓#16597↓0.121.1 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↓0.1022.3 years↑
"
: Draw a card, then discard a card."
: Draw a card, then discard a card."