Veiled Serpent

Serpiente velada (Veiled Serpent) (es)

Enchantment (CMC 3)
When an opponent casts a spell, if Veiled Serpent is an enchantment, Veiled Serpent becomes a 4/4 Serpent creature with "This creature can't attack unless defending player controls an Island."
Cycling (, Discard this card: Draw a card.)