Alchemist's Cove

Alchemist's Cove enters the battlefield tapped.
{t}, Add {u} to your mana pool
{w}{u}, {t}: Switch target creature's power and toughness until end of turn.
Indestructible
Whenever Alchemist's Cove becomes a creature,
it gets +5/+5, flying, trample, and vigilance until
end of turn.