Hidden Spider 
Enchantment
$0.29 #20701 0.14 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. (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%
$0.16↓#30363↓0.0727.9 years
"When an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/2 Gargoyle creature with flying."
Opal Acrolith88%
$0.26↓#30433↓0.29↑27.9 years
"Whenever an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/4 Soldier creature."
Opal Caryatid88%
$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 Archangel88%
$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."
Veil of Birds88%
$0.15↓#28336↓0.33↑27.9 years
"When an opponent casts a spell, if this permanent is an enchantment, it becomes a 1/1 Bird creature with flying."
Hidden Ancients82%
$0.23↓#27519↓0.1227.9 years
"When an opponent casts an enchantment spell, if this permanent is an enchantment, it becomes a 5/5 Treefolk creature."
Veiled Apparition81%
$0.18↓#31544↓0.29↑27.9 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 Guardian81%
$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 Champion81%
$0.14↓#30582↓0.44↑27.6 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 Gibbons79%
$11.67↑#189300.38↑27.6 years
"When an opponent casts an instant spell, if this permanent is an enchantment, it becomes a 4/4 Ape creature."
Hidden Guerrillas76%
$0.37↑#25985↓0.0727.9 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↓#28365↓0.1927.9 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."
Opal Titan76%
$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 Skirge71%
$0.55↑#31256↓0.0727.6 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↓#27935↓0.0527.9 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 Stag70%
$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."
Lurking Jackals70%
$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."