Towards the Horizon

Search your library for a basic land card, reveal it
and put it into your hand. If this spell's name
isn't Towards the Horizon, put that card onto
the battlefield instead. Then shuffle your library.
Splice onto Arcane {3}{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.)