Genesis Chamber 
Artifact
$3.82 #2820 0.27 22.6 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?
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Bramble Sovereign80%
$3.90↑#4769↓0.238.2 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%
$4.97↑#16529↓0.3321.3 years↓
"Whenever a land enters, its controller creates a 1/1 green Snake creature token."
Dual Nature76%
$2.62↓#19659↓0.86↑26.3 years↑
"Whenever a nontoken creature enters, its controller creates a token that's a copy of that creature."