It departs through the streets' fissures with a sound like gravel pouring into a pond.

Ravnica Remastered

Petrahydrox

When Petrahydrox becomes the target of a spell or ability, return Petrahydrox to its owner's hand.

({U/R} can be paid with either {U} or {R}.)
When Petrahydrox becomes the target of a spell or ability, return Petrahydrox to its owner's hand.

({UR} can be paid with either {U} or {R}.)
When Petrahydrox becomes the target of a spell or ability, return Petrahydrox to its owner's hand.