Shining Waters

Shining Waters enters the battlefield tapped.

{t}: Add {u} or {r}.

Mentality - Whenever you cast an instant or
sorcery spell, if it's the first spell you've cast this
turn, reveal the top card of your library. If a noncreature spell with mana value 3 or less is
revealed this way, you may cast it without paying
its mana cost. Then, shuffle.