Omnath, Locus of Mana 
Legendary Creature — Elemental
$3.96 #3698 0.50 16.6 years
You don't lose unspent green mana as steps and phases end.
Omnath gets +1/+1 for each unspent green mana you have.
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Cards similar to Omnath, Locus of Mana 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.
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Electro, Assaulting Battery72%
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"You don't lose unspent red mana as steps and phases end."
Ashling, Flame Dancer70%
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"You don't lose unspent red mana as steps and phases end."