Opal Acrolith 

Enchantment
$0.26 #30678 0.00 28.0 years
Whenever an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/4 Soldier creature.
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Opal Caryatid100%
$0.10↓#308030.13↑28.0 years
"When an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/2 Soldier creature."
Hidden Ancients94%
$0.24↓#279340.0628.0 years
"When an opponent casts an enchantment spell, if this permanent is an enchantment, it becomes a 5/5 Treefolk creature."
Opal Gargoyle94%
$0.18↓#306390.0628.0 years
"When an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/2 Gargoyle creature with flying."
Opal Champion92%
$0.10↓#307970.0027.7 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 Gibbons91%
$11.06↑#19381↑0.0027.7 years
"When an opponent casts an instant spell, if this permanent is an enchantment, it becomes a 4/4 Ape creature."
Veil of Birds91%
$0.14↓#286030.0028.0 years
"When an opponent casts a spell, if this permanent is an enchantment, it becomes a 1/1 Bird creature with flying."
Opal Archangel91%
$2.15↑#297180.11↑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."
Ride the Shoopuf88%
$0.29↑#3528↑0.28↑1.4 years↓
"

: This enchantment becomes a 7/7 Beast creature in addition to its other types."
Hidden Spider88%
$0.35↑#21041↑0.0728.0 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."
Veiled Sentry88%
$0.25↓#287200.12↑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."
Opal Titan87%
$0.42↑#301380.0028.0 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."
Opal Guardian86%
$0.24↓#307280.0020.0 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."
Veiled Apparition86%
$0.21↓#317800.0028.0 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 Guerrillas86%
$0.38↑#263120.11↑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."
Veiled Serpent84%
$0.06↓#282350.0028.0 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.""
Lurking Jackals80%
$0.16↓#321070.0027.4 years
"When an opponent has 10 or less life, if this permanent is an enchantment, it becomes a 3/2 Jackal creature."
Hidden Stag80%
$0.44↑#298860.0028.0 years
"Whenever an opponent plays a land, if this permanent is an enchantment, it becomes a 3/2 Elk Beast creature."
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Hidden Predators79%
$0.48↑#282060.0028.0 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."
Hidden Herd78%
$0.42↑#286680.33↑28.0 years
"When an opponent plays a nonbasic land, if this permanent is an enchantment, it becomes a 3/3 Beast creature."