Opal Avenger 

Enchantment
$0.31 #31795 0.00 27.7 years
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 similar to Opal Avenger 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.
Lurking Jackals90%
$0.16↓#321070.0027.4 years
"When an opponent has 10 or less life, if this permanent is an enchantment, it becomes a 3/2 Jackal creature."
Veiled Crocodile78%
$0.41↑#311120.25↑28.0 years
"When a player has no cards in hand, if this permanent is an enchantment, it becomes a 4/4 Crocodile creature."
Hidden Stag72%
$0.44↑#298860.0028.0 years
"Whenever you play a land, if this permanent is a creature, it becomes an enchantment."