Summoner's Egg 
Artifact Creature — Egg
$4.08 #15665 0.44 22.3 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%
$0.11↓#131790.57↑15.9 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%
$0.64↓#12255↑0.65↑22.9 years
"When this artifact enters, you may exile a creature card from your hand."
Root Elemental72%
$0.24↓#137050.00↓23.3 years↑
"When this creature is turned face up, you may put a creature card from your hand onto the battlefield."
Elite Arcanist72%
$0.28↓#173150.24↓13.1 years↓
"When this creature enters, you may exile an instant card from your hand."
Spellbinder70%
$6.39↑#152750.3822.6 years
"When this Equipment enters, you may exile an instant card from your hand."
Ilharg, the Raze-Boar70%
$8.20↑#2462↑0.55↑7.3 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."