Upwelling 
Enchantment
$1.08 #14357 0.59 23.4 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%
$4.11↑#3736↑0.76↑16.7 years↓
"You don't lose unspent green mana as steps and phases end."
Leyline Tyrant77%
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"You don't lose unspent red mana as steps and phases end."
The Last Agni Kai71%
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"Until end of turn, you don't lose unspent red mana as steps and phases end."
Fangorn, Tree Shepherd70%
$0.34↓#7280↑0.36↓3.3 years↓
"You don't lose unspent green mana as steps and phases end."