Dual Nature {4}{G}{G}
Enchantment
Whenever a nontoken creature enters, its controller creates a token that's a copy of that creature.
Whenever a nontoken creature leaves the battlefield, exile all tokens with the same name as that creature.
When this enchantment leaves the battlefield, exile all tokens created with this enchantment.
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Cards that do something similar 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.
Molten Echoes 91%
$10.14#2348
"Whenever a nontoken creature you control of the chosen type enters, create a token that's a copy of that creature. That token gains haste. Exile it at the beginning of the next end step."
Theoretical Duplication 85%
$0.61#6205
"Whenever a nontoken creature an opponent controls enters this turn, create a token that's a copy of that creature."
Life of the Party 85%
$11.75#5019
"When this creature enters, if it's not a token, each opponent creates a token that's a copy of it. The tokens are goaded for the rest of the game."
Arcane Artisan 84%
$0.31#18655
"When this creature leaves the battlefield, exile all tokens created with it at the beginning of the next end step."
Renegade Doppelganger 83%
$0.50#19450
"Whenever another creature you control enters, you may have this creature become a copy of that creature until end of turn."
Faerie Artisans 83%
$2.15#4853
"Whenever a nontoken creature an opponent controls enters, create a token that's a copy of that creature except it's an artifact in addition to its other types. Then exile all other tokens created with this creature."
Twilight Diviner 82%
$1.99#3533
"Whenever one or more other creatures you control enter, if they entered or were cast from a graveyard, create a token that's a copy of one of them. This ability triggers only once each turn."
Gruff Triplets 81%
$0.38#5174
"When this creature enters, if it isn't a token, create two tokens that are copies of it."
Preston, the Vanisher 81%
$33.07#3792
"Whenever another nontoken creature you control enters, if it wasn't cast, create a token that's a copy of that creature, except it's a 0/1 white Illusion."