Child of Gaea {3}{G}{G}{G}
Creature — Elemental
Trample
At the beginning of your upkeep, sacrifice this creature unless you pay {G}{G}.
{1}{G}: Regenerate this creature.
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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.
Darba 100%
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"At the beginning of your upkeep, sacrifice this creature unless you pay {G}{G}."
Krosan Cloudscraper 100%
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"At the beginning of your upkeep, sacrifice this creature unless you pay {G}{G}."
+1 more matching line
Hungry Mist 100%
#30250
"At the beginning of your upkeep, sacrifice this creature unless you pay {G}{G}."
Kami of the Tended Garden 95%
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"At the beginning of your upkeep, sacrifice this creature unless you pay {G}."
Wild Leotau 95%
$0.08#31338
"At the beginning of your upkeep, sacrifice this creature unless you pay {G}."
Razormane Masticore 81%
$0.21#26753
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Molten-Tail Masticore 81%
$0.39#29145
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
+1 more matching line
Masticore 81%
#24663
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
+1 more matching line