Azusa's Sprout

Search your library for a basic land card, put it
onto the battlefield, then shuffle your library.
Until end of turn, it becomes a 1/1 white Spirit
creature with flying. It's still a land. Return it
to your hand at the beginning of the next end
step.
Splice onto Arcane {4}{g}(As you cast an Arcane
spell, you may reveal this card from your hand and
pay its splice cost. If you do, add this card's effects to
that spell.)