Genesis Chamber 
Artifact
$3.46 #2844 0.20 22.7 years
Whenever a nontoken creature enters, if this artifact is untapped, that creature's controller creates a 1/1 colorless Myr artifact creature token.
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Cards similar to Genesis Chamber 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.
Bramble Sovereign80%
$1.05↓#4696↓0.58↑8.4 years↓
"Whenever another nontoken creature enters, you may pay 
. If you do, that creature's controller creates a token that's a copy of that creature."
. If you do, that creature's controller creates a token that's a copy of that creature."
Seed the Land77%
$5.62↑#16765↓0.06↓21.4 years↓
"Whenever a land enters, its controller creates a 1/1 green Snake creature token."
Dual Nature76%
$2.69↓#20065↓0.35↑26.4 years↑
"Whenever a nontoken creature enters, its controller creates a token that's a copy of that creature."