Fateful Discovery 
Enchantment
£3.34 #6421 0.58 0.3 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 Dinosaur91%
£0.18↓#19760↓0.21↓0.4 years
"Whenever an artifact you control enters, draw a card. This ability triggers only once each turn."
Iron Man, Master of Machines90%
£0.17↓#10987↓0.35↓0.4 years
"Whenever this card attacks, if an artifact entered the battlefield under your control this turn, draw a card."
Skyswimmer Koi88%
£0.12↓#17589↓0.00↓4.7 years↑
"Whenever an artifact you control enters, you may draw a card. If you do, discard a card."
Rook Turret88%
£0.11↓#8230↓0.06↓1.4 years↑
"Whenever another artifact you control enters, you may draw a card. If you do, discard a card."
Quicksmith Genius87%
£0.16↓#8294↓0.10↓10.1 years↑
"Whenever an artifact you control enters, you may discard a card. If you do, draw a card."
Fixer, Techno Terror86%
£0.15↓#25599↓0.12↓0.4 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%
£0.12↓#15751↓0.15↓0.4 years
"Whenever another artifact you control enters, put a +1/+1 counter on this creature."
Donatello, Way with Machines84%
£0.11↓#13053↓0.20↓0.7 years
"Whenever an artifact you control enters, put a +1/+1 counter on this card."
Towashi Songshaper84%
£0.05↓#26542↓0.12↓4.7 years↑
"Whenever another artifact you control enters, this creature gets +1/+0 until end of turn."
Phalanx Vanguard84%
£0.03↓#27747↓0.00↓4.0 years↑
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Perimeter Patrol84%
£0.03↓#31217↓0.00↓4.0 years↑
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Oreplate Pangolin82%
£0.07↓#16565↓0.00↓1.3 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."
Serum Tank82%
£0.11↓#23238↓0.00↓23.1 years↑
"Whenever this artifact or another artifact enters, put a charge counter on this artifact."
Glaze Fiend82%
£0.12↓#24845↓0.00↓18.1 years↑
"Whenever another artifact you control enters, this creature gets +2/+2 until end of turn."
Karstoderm82%
£0.04↓#32531↓0.00↓22.8 years↑
"Whenever an artifact enters, remove a +1/+1 counter from this creature."
Mandible Justiciar82%
£0.08↓#17146↓0.19↓3.8 years↑
"Whenever another artifact you control enters, this creature gets +1/+1 until end of turn."
Mechan Assembler82%
£0.15↓#9963↓0.00↓1.3 years↑
"Whenever another artifact you control enters, create a 2/2 colorless Robot artifact creature token. This ability triggers only once each turn."
Vedalken Archmage80%
£2.34↓#3010↑0.31↓23.1 years↑
"Whenever you cast an artifact spell, draw a card."
Yotian Dissident80%
£0.18↓#10118↓0.45↓4.0 years↑
"Whenever an artifact you control enters, put a +1/+1 counter on target creature you control."
Transplant Theorist80%
£0.17↓#9972↓0.25↓3.8 years↑
"Whenever this creature or another artifact you control enters, you may draw a card. If you do, discard a card."