flavorText: It departs through the streets' fissures with a sound like gravel pouring into a pond.
name: Petrahydrox
originalText: When Petrahydrox becomes the target of a spell or ability, return Petrahydrox to its owner's hand.
printings: GPT, RVR
text: ({U/R} can be paid with either {U} or {R}.)
  When this creature becomes the target of a spell or ability, return this creature to its owner's hand.
type: Creature — Weird