Rennala, Queen of the Moon

Flying
Whenever you cast an instant or sorcery spell,
create a 1/1 sweetling creature token. As long
as you control one or more sweetlings, Rennala,
Queen of the Moon has indestructible.
{3}{w}{u}{t}: Exile Rennala, Queen of the Moon
and return it to the battlefield transformed.
Activate only if you control no sweetling
creature tokens.