Ozai, the Phoenix King 
Legendary Creature — Human Noble
$4.59 #3793 0.51 0.9 years
Trample, firebending 4, haste
If you would lose unspent mana, that mana becomes red instead.
Ozai has flying and indestructible as long as you have six or more unspent mana.
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Cards similar to Ozai, the Phoenix King 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 the Void86%
$3.13↓#10185↓0.460.0 years
"If you would lose unspent mana, that mana becomes colorless instead."
+1 more matching line
Horizon Stone74%
$1.14↓#41270.32↓5.9 years↑
"If you would lose unspent mana, that mana becomes colorless instead."