Hidden Spider
Mana cost
Mana value1TypeEnchantment
Color identity
Green
RarityCommon
SetUrza's Saga (USG)
ArtistThomas M. Baxa
Price€0.35 · $0.36
Hidden Spider 
Enchantment
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.)
It wants only to dress you in silk.
Legality
CommanderLegalStandardNot legalPioneerNot legalModernNot legalLegacyLegalVintageLegalPauperLegalBrawlNot legalOathbreakerLegalHistoricNot legalTimelessNot legalPenny DreadfulNot legal
Rulings
2008-08-01
A noncreature permanent that turns into a creature can attack, and its abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of their most recent turn. It doesn't matter how long the permanent has been a creature.
2008-05-01
The ability only triggers if the creature spell has flying, regardless of whether an effect would cause the creature to have flying once it entered.
2008-04-01
This card now uses the Reach keyword ability to enable the blocking of flying creatures. This works because a creature with flying can only be blocked by creatures with flying or reach.
2004-10-04
When it turns into a creature, it is no longer an enchantment.