Raider of Storms

When Raider of Storms enters the battlefield
you may cast target instant or sorcery card with
converted mana value of 2 or less from your
graveyard without paying its mana cost.
Whenever you cast an instant or sorcery card for
the first time each turn, create a colourless
treasure token with "{t}, Sacrifice this artifact:
Add one mana of any color"