Opal Avenger {2}{W}
Enchantment
When you have 10 or less life, if this permanent is an enchantment, it becomes a 3/5 Soldier creature.
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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.
Break of Day 81%
$0.13#26961
"If you have 5 or less life, those creatures gain indestructible until end of turn."
Gather the Townsfolk 81%
$0.17#11823
"If you have 5 or less life, create five of those tokens instead."