Veil of Birds 
Enchantment
$0.14 #28603 0.00 28.0 years
When an opponent casts a spell, if this permanent is an enchantment, it becomes a 1/1 Bird creature with flying.
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Cards similar to Veil of Birds expected a card that isn't here?
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Opal Gargoyle98%
$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 Archangel95%
$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."
Veiled Apparition94%
$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 
.""
Opal Acrolith91%
$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 Caryatid91%
$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."
Opal Guardian90%
$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."
Opal Champion89%
$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 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."
Hidden Gibbons88%
$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."
Hidden Ancients86%
$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."
Veiled Sentry85%
$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."
Lurking Skirge84%
$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."
Veiled Serpent81%
$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.""
Hidden Guerrillas80%
$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."
Lurking Jackals78%
$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."
Opal Titan77%
$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."
Hidden Stag76%
$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."
Emergent Haunting72%
$0.15↑#263460.22↑2.5 years↓
"At the beginning of your end step, if you haven't cast a spell from your hand this turn and this enchantment isn't a creature, it becomes a 3/3 Spirit creature with flying in addition to its other types."
Veiled Crocodile71%
$0.41↑#311120.25↑28.0 years
"When a player has no cards in hand, if this permanent is an enchantment, it becomes a 4/4 Crocodile creature."