Hidden Gibbons 
Enchantment
$11.06 #19381 0.00 27.7 years
When an opponent casts an instant spell, if this permanent is an enchantment, it becomes a 4/4 Ape creature.
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Cards similar to Hidden Gibbons expected a card that isn't here?
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Opal Caryatid92%
$0.10↓#30803↓0.13↑28.0 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↓#30678↓0.0028.0 years
"Whenever an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/4 Soldier creature."
Veil of Birds88%
$0.14↓#28603↓0.0028.0 years
"When an opponent casts a spell, if this permanent is an enchantment, it becomes a 1/1 Bird creature with flying."
Opal Champion88%
$0.10↓#30797↓0.0027.7 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%
$0.24↓#27934↓0.0628.0 years
"When an opponent casts an enchantment spell, if this permanent is an enchantment, it becomes a 5/5 Treefolk creature."
Opal Gargoyle86%
$0.18↓#30639↓0.0628.0 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↓#28720↓0.12↑28.0 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↓#28972↓0.0032.4 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%
$0.21↓#31780↓0.0028.0 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 Archangel82%
$2.15↓#29718↓0.11↑28.0 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↓#28235↓0.0028.0 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%
$0.38↓#26312↓0.11↑28.0 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%
$0.35↓#210410.0728.0 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%
$0.44↓#29886↓0.0028.0 years
"Whenever an opponent plays a land, if this permanent is an enchantment, it becomes a 3/2 Elk Beast creature."
Opal Guardian76%
$0.24↓#30728↓0.0020.0 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 Titan76%
$0.42↓#30138↓0.0028.0 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%
$0.16↓#32107↓0.0027.4 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%
$0.22↓#1025↑0.33↑6.7 years↓
"Whenever an opponent casts an instant or sorcery spell, create a 1/2 green Spider creature token with reach."
Veiled Crocodile71%
$0.41↓#31112↓0.25↑28.0 years
"When a player has no cards in hand, if this permanent is an enchantment, it becomes a 4/4 Crocodile creature."