Tempermental Sea

{t} add x {u} to your mana pool, where x is your devotion to blue.
{t} target creature cannot block or attack this turn.
{u}{u}{u}{u}{u}; Tempermental Sea becomes a 5/10 elemental creature (with indestructible, that has to be blocked with all creatures the defending player controls) until end of turn. Activate this ability only if you have taken damage since your last turn.
"Beguiling one moment, drowning you the next."-Umlindi the Unseen