Opal Guardian 
Enchantment
$0.24 #30728 0.00 20.0 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.
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Cards similar to Opal Guardian expected a card that isn't here?
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Opal Gargoyle91%
$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."
Veil of Birds90%
$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 Archangel90%
$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."
Opal Titan90%
$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 Acrolith86%
$0.26↑#306780.0028.0 years↑
"Whenever an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/4 Soldier creature."
Opal Caryatid86%
$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."
Veiled Apparition84%
$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 Spider82%
$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."
Opal Champion80%
$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 Ancients80%
$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."
Hidden Gibbons76%
$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."
Lurking Skirge72%
$0.58↑#315850.11↑27.7 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."
Hidden Guerrillas72%
$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 Sentry72%
$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."
Keeper of Kookus72%
$0.15↓#291400.0629.7 years↑
"
: This creature gains protection from red until end of turn."
: This creature gains protection from red until end of turn."
Aven Smokeweaver70%
$0.21↓#292340.18↑25.1 years↑
"Flying, protection from red"
Thermal Glider70%
$0.13↓#272050.0027.0 years↑
"Flying, protection from red"
Hazerider Drake70%
$0.24#319510.50↑30.0 years↑
"Flying, protection from red"
Sea Sprite70%
$0.20↓#270780.0031.1 years↑
"Flying, protection from red"
Weatherseed Faeries70%
$0.15↓#282680.12↑27.7 years↑
"Flying, protection from red"