Fateful Discovery 
Enchantment
-0.0 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%
$0.25#218950.000.1 years
"Whenever an artifact you control enters, draw a card. This ability triggers only once each turn."
Iron Man, Master of Machines90%
$0.26#141340.000.1 years
"Whenever this card attacks, if an artifact entered the battlefield under your control this turn, draw a card."
Skyswimmer Koi88%
$0.14#169590.364.4 years↑
"Whenever an artifact you control enters, you may draw a card. If you do, discard a card."
Rook Turret88%
$0.22#87050.111.1 years↑
"Whenever another artifact you control enters, you may draw a card. If you do, discard a card."
Quicksmith Genius87%
$0.24#80380.199.8 years↑
"Whenever an artifact you control enters, you may discard a card. If you do, draw a card."
Fixer, Techno Terror86%
$0.35#275000.000.1 years
"
, Pay 2 life: Draw a card. Activate only if an artifact entered under your control this turn."
, Pay 2 life: Draw a card. Activate only if an artifact entered under your control this turn."
Surge Conductor85%
$0.37#28910.371.0 years↑
"Whenever another nontoken artifact you control enters, proliferate."
Machinesmith Automaton84%
$0.15#203710.000.1 years
"Whenever another artifact you control enters, put a +1/+1 counter on this creature."
Leonin Elder84%
$0.32#80530.2922.8 years↑
"Whenever an artifact enters, you may gain 1 life."
Towashi Songshaper84%
$0.10#254900.004.4 years↑
"Whenever another artifact you control enters, this creature gets +1/+0 until end of turn."
Perimeter Patrol84%
$0.04#301120.003.7 years↑
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Phalanx Vanguard84%
$0.06#266040.273.7 years↑
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Donatello, Way with Machines83%
$0.14#140040.000.4 years
"Whenever an artifact you control enters, put a +1/+1 counter on this card."
Glaze Fiend82%
$0.15#240030.0017.8 years↑
"Whenever another artifact you control enters, this creature gets +2/+2 until end of turn."
Oreplate Pangolin82%
$0.10#165240.121.0 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%
$0.21#98900.293.7 years↑
"Whenever an artifact you control enters, put a +1/+1 counter on target creature you control."
Serum Tank82%
$0.16#227720.2422.8 years↑
"Whenever this artifact or another artifact enters, put a charge counter on this artifact."
Mandible Justiciar82%
$0.21#165060.243.5 years↑
"Whenever another artifact you control enters, this creature gets +1/+1 until end of turn."
Mechan Assembler82%
$0.24#104140.161.0 years↑
"Whenever another artifact you control enters, create a 2/2 colorless Robot artifact creature token. This ability triggers only once each turn."
Karstoderm82%
$0.06#315860.3522.5 years↑
"Whenever an artifact enters, remove a +1/+1 counter from this creature."