Hidden Spider 
Enchantment
$0.35 #21041 0.07 28.0 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. (It can block creatures with flying.)
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Cards similar to Hidden Spider expected a card that isn't here?
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Opal Gargoyle91%
$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."
Opal Archangel89%
$2.15↑#29718↓0.1128.0 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."
Opal Acrolith88%
$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."
Opal Caryatid88%
$0.10↓#30803↓0.1328.0 years
"When an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/2 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."
Hidden Ancients82%
$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 Guardian82%
$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 Champion82%
$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."
Veiled Apparition81%
$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 
.""
.""
Hidden Gibbons79%
$11.06↑#193810.0027.7 years
"When an opponent casts an instant spell, if this permanent is an enchantment, it becomes a 4/4 Ape creature."
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."
Hidden Guerrillas76%
$0.38↑#26312↓0.1128.0 years
"When an opponent casts an artifact spell, if this permanent is an enchantment, it becomes a 5/3 Soldier creature with trample."
Veiled Sentry76%
$0.25↓#28720↓0.1228.0 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."
Lurking Skirge71%
$0.58↑#31585↓0.1127.7 years
"When a creature is put into an opponent's graveyard from the battlefield, if this permanent is an enchantment, it becomes a 3/2 Phyrexian Imp creature with flying."
Veiled Serpent70%
$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 Stag70%
$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."
Lurking Jackals70%
$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."