Fateful Discovery 
Enchantment
$3.87 #11658 0.00 0.1 years
Whenever an artifact you control enters, draw a card.
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Cards similar to Fateful Discovery 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.
Moon Girl and Devil Dinosaur90%
$0.24↓#20449↓0.000.2 years
"Whenever an artifact you control enters, draw a card. This ability triggers only once each turn."
Iron Man, Master of Machines90%
$0.29↓#120530.000.2 years
"Whenever this card attacks, if an artifact entered the battlefield under your control this turn, draw a card."
Skyswimmer Koi88%
$0.15↓#17237↓0.36↑4.6 years↑
"Whenever an artifact you control enters, you may draw a card. If you do, discard a card."
Rook Turret88%
$0.20↓#8456↑0.11↑1.3 years↑
"Whenever another artifact you control enters, you may draw a card. If you do, discard a card."
Quicksmith Genius87%
$0.29↓#8194↑0.19↑10.0 years↑
"Whenever an artifact you control enters, you may discard a card. If you do, draw a card."
Fixer, Techno Terror86%
$0.26↓#26170↓0.000.2 years
"
, Pay 2 life: Draw a card. Activate only if an artifact entered the battlefield under your control this turn."
, Pay 2 life: Draw a card. Activate only if an artifact entered the battlefield under your control this turn."
Machinesmith Automaton84%
$0.18↓#17449↓0.000.2 years
"Whenever another artifact you control enters, put a +1/+1 counter on this creature."
Towashi Songshaper84%
$0.10↓#25915↓0.004.6 years↑
"Whenever another artifact you control enters, this creature gets +1/+0 until end of turn."
Perimeter Patrol84%
$0.04↓#30512↓0.003.8 years↑
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Phalanx Vanguard84%
$0.07↓#27128↓0.27↑3.8 years↑
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Donatello, Way with Machines83%
$0.19↓#135440.000.5 years
"Whenever an artifact you control enters, put a +1/+1 counter on this card."
Serum Tank82%
$0.13↓#23109↓0.24↑23.0 years↑
"Whenever this artifact or another artifact enters, put a charge counter on this artifact."
Glaze Fiend82%
$0.18↓#24406↓0.0018.0 years↑
"Whenever another artifact you control enters, this creature gets +2/+2 until end of turn."
Oreplate Pangolin82%
$0.15↓#16590↓0.12↑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."
Yotian Dissident82%
$0.27↓#99530.29↑3.8 years↑
"Whenever an artifact you control enters, put a +1/+1 counter on target creature you control."
Mandible Justiciar82%
$0.18↓#16824↓0.24↑3.6 years↑
"Whenever another artifact you control enters, this creature gets +1/+1 until end of turn."
Mechan Assembler82%
$0.26↓#101680.16↑1.1 years↑
"Whenever another artifact you control enters, create a 2/2 colorless Robot artifact creature token. This ability triggers only once each turn."
Karstoderm82%
$0.05↓#31893↓0.35↑22.6 years↑
"Whenever an artifact enters, remove a +1/+1 counter from this creature."
Vedalken Archmage80%
$12.26↑#3119↑0.50↑23.0 years↑
"Whenever you cast an artifact spell, draw a card."
Transplant Theorist80%
$0.24↓#97620.41↑3.6 years↑
"Whenever this creature or another artifact you control enters, you may draw a card. If you do, discard a card."