Mana Bloom {X}{G}
Enchantment
This enchantment enters with X charge counters on it.
Remove a charge counter from this enchantment: Add one mana of any color. Activate only once each turn.
At the beginning of your upkeep, if this enchantment has no charge counters on it, return it to its owner's hand.
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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.
Druids' Repository 100%
$3.25#6898
"Remove a charge counter from this enchantment: Add one mana of any color."
+1 more matching line
Riptide Chimera 87%
$0.25#18221
"At the beginning of your upkeep, return an enchantment you control to its owner's hand."
Death Spark 86%
#24614
"At the beginning of your upkeep, if this card is in your graveyard with a creature card directly above it, you may pay {1}. If you do, return this card to your hand."
Gemstone Array 84%
$0.89#13427
"Remove a charge counter from this artifact: Add one mana of any color."
Pentad Prism 84%
$0.30#4257
"Remove a charge counter from this artifact: Add one mana of any color."
Imaginary Pet 83%
$0.45#24041
"At the beginning of your upkeep, if you have a card in hand, return this creature to its owner's hand."
Gigapede 82%
#20892
"At the beginning of your upkeep, if this card is in your graveyard, you may discard a card. If you do, return this card to your hand."
Complex Automaton 80%
$0.37#30184
"At the beginning of your upkeep, if you control seven or more permanents, return this creature to its owner's hand."