Upwelling 
Enchantment
$1.07 #14131 0.55 23.3 years
Players don't lose unspent mana as steps and phases end.
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Cards similar to Upwelling 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.
Omnath, Locus of Mana88%
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Leyline Tyrant77%
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Fangorn, Tree Shepherd70%
$0.35↓#7266↑0.86↑3.2 years↓
"You don't lose unspent green mana as steps and phases end."