Summoner's Egg 
Artifact Creature — Egg
$3.87 #15860 0.58 22.4 years
Imprint — When this creature enters, you may exile a card from your hand face down.
When this creature dies, turn the exiled card face up. If it's a creature card, put it onto the battlefield under your control.
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Cards similar to Summoner's Egg 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.
Clone Shell87%
$0.12↓#134220.25↓16.1 years↓
"When this creature dies, turn the exiled card face up. If it's a creature card, put it onto the battlefield under your control."
+1 more matching line
Soul Foundry74%
$0.53↓#12480↑0.18↓23.0 years
"When this artifact enters, you may exile a creature card from your hand."
Elite Arcanist72%
$0.31↓#175960.31↓13.3 years↓
"When this creature enters, you may exile an instant card from your hand."
Root Elemental71%
$0.25↓#141520.28↓23.4 years↑
"When this creature is turned face up, you may put a creature card from your hand onto the battlefield."
Spellbinder70%
$6.27↑#154660.19↓22.7 years
"When this Equipment enters, you may exile an instant card from your hand."
Ilharg, the Raze-Boar70%
$2.34↓#2483↑0.40↓7.5 years↓
"When this card dies or is put into exile from the battlefield, you may put it into its owner's library third from the top."