Veiled Sentry
Mana cost
Mana value1TypeEnchantment
Color identity
Blue
RarityUncommon
SetUrza's Saga (USG)
ArtistRon Spears
Price€0.25 · $0.25
Veiled Sentry 
Enchantment
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.
Legality
CommanderLegalStandardNot legalPioneerNot legalModernNot legalLegacyLegalVintageLegalPauperNot legalBrawlNot legalOathbreakerLegalHistoricNot legalTimelessNot legalPenny DreadfulLegal
Rulings
2004-10-04
If the spell is no longer on the stack when the triggered ability resolves, the mana value of the spell is still remembered.
2004-10-04
When it turns into a creature, it is no longer an enchantment.
2004-10-04
It changes into a creature even if the spell is countered.
2004-10-04
It triggers when the spell is cast, which means it becomes a creature before that spell resolves.