Hidden Predators 
Enchantment
$0.48 #27848 0.29 27.9 years
When an opponent controls a creature with power 4 or greater, if this permanent is an enchantment, it becomes a 4/4 Beast creature.
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Cards similar to Hidden Predators 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 Jackals83%
$0.19↓#318210.00↓27.2 years
"When an opponent has 10 or less life, if this permanent is an enchantment, it becomes a 3/2 Jackal creature."
Opal Caryatid80%
$0.11↓#305350.00↓27.9 years
"When an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/2 Soldier creature."
Opal Acrolith80%
$0.26↓#304330.2927.9 years
"Whenever an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/4 Soldier creature."
Veiled Crocodile76%
$0.45↓#308630.11↓27.9 years
"When a player has no cards in hand, if this permanent is an enchantment, it becomes a 4/4 Crocodile creature."
Opal Gargoyle73%
$0.16↓#303630.07↓27.9 years
"When an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/2 Gargoyle creature with flying."
Opal Avenger72%
$0.41↓#315700.3827.6 years
"When you have 10 or less life, if this permanent is an enchantment, it becomes a 3/5 Soldier creature."
Hidden Ancients71%
$0.23↓#275190.12↓27.9 years
"When an opponent casts an enchantment spell, if this permanent is an enchantment, it becomes a 5/5 Treefolk creature."
Duskmantle Operative70%
$0.05↓#245470.53↑7.3 years↓
"This creature can't be blocked by creatures with power 4 or greater."