Mirror Puddles

{1}, {t}: Add {u} to your mana pool.

Whenever you would cast your second blue spell
this turn, Mirror Puddles becomes a 1/1 artifact creature until end of turn. It is an Elemental in addition to its other types, and it gains haste and vigilance.

A freshly laid blanket of rain is a hassle for traditional festivals and performances. The ambiance can bring incidental invocations.