Hidden Gibbons 
Enchantment
$11.67 #18930 0.38 27.6 years
When an opponent casts an instant spell, if this permanent is an enchantment, it becomes a 4/4 Ape creature.
Click a line or tag to filter
Cards similar to Hidden Gibbons 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.
Opal Caryatid92%
$0.11↓#30535↓0.00↓27.9 years
"When an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/2 Soldier creature."
Opal Acrolith91%
$0.26↓#30433↓0.2927.9 years
"Whenever an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/4 Soldier creature."
Veil of Birds88%
$0.15↓#28336↓0.3327.9 years
"When an opponent casts a spell, if this permanent is an enchantment, it becomes a 1/1 Bird creature with flying."
Opal Champion88%
$0.14↓#30582↓0.4427.6 years
"When an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 3/3 Knight creature with first strike."
Hidden Ancients86%
$0.23↓#27519↓0.12↓27.9 years
"When an opponent casts an enchantment spell, if this permanent is an enchantment, it becomes a 5/5 Treefolk creature."
Opal Gargoyle86%
$0.16↓#30363↓0.07↓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."
Veiled Sentry86%
$0.25↓#28365↓0.19↓27.9 years
"When an opponent casts a spell, if this permanent is an enchantment, it becomes an Illusion creature with power and toughness each equal to that spell's mana value."
Ichneumon Druid82%
$3.47↓#28538↓0.3132.3 years↑
"Whenever an opponent casts an instant spell other than the first instant spell that player casts each turn, this creature deals 4 damage to that player."
Veiled Apparition82%
$0.18↓#31544↓0.2927.9 years
"When an opponent casts a spell, if this permanent is an enchantment, it becomes a 3/3 Illusion creature with flying and "At the beginning of your upkeep, sacrifice this creature unless you pay 
.""
.""
Opal Archangel81%
$2.10↓#29473↓0.53↑27.9 years
"When an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 5/5 Angel creature with flying and vigilance."
Veiled Serpent80%
$0.06↓#27935↓0.05↓27.9 years
"When an opponent casts a spell, if this permanent is an enchantment, it becomes a 4/4 Serpent creature with "This creature can't attack unless defending player controls an Island.""
Hidden Guerrillas79%
$0.37↓#25985↓0.07↓27.9 years
"When an opponent casts an artifact spell, if this permanent is an enchantment, it becomes a 5/3 Soldier creature with trample."
Hidden Spider79%
$0.29↓#207010.14↓27.9 years
"When an opponent casts a creature spell with flying, if this permanent is an enchantment, it becomes a 3/5 Spider creature with reach."
Hidden Stag76%
$0.46↓#29548↓0.53↑27.9 years
"Whenever an opponent plays a land, if this permanent is an enchantment, it becomes a 3/2 Elk Beast creature."
Opal Guardian76%
$0.18↓#30498↓0.00↓19.9 years↓
"When an opponent casts a creature spell, if this permanent is an enchantment, this enchantment becomes a 3/4 Gargoyle creature with flying and protection from red."
Opal Titan75%
$0.47↓#29821↓0.27↓27.9 years
"When an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 4/4 Giant creature with protection from each of that spell's colors."
Lurking Jackals74%
$0.19↓#31821↓0.00↓27.2 years
"When an opponent has 10 or less life, if this permanent is an enchantment, it becomes a 3/2 Jackal creature."
Arasta of the Endless Web73%
$0.40↓#1017↑0.25↓6.6 years↓
"Whenever an opponent casts an instant or sorcery spell, create a 1/2 green Spider creature token with reach."
Veiled Crocodile71%
$0.45↓#30863↓0.11↓27.9 years
"When a player has no cards in hand, if this permanent is an enchantment, it becomes a 4/4 Crocodile creature."
Mogg Sentry71%
$0.33↓#223040.00↓25.6 years↓
"Whenever an opponent casts a spell, this creature gets +2/+2 until end of turn."