Iteras, the Spark Wind

Flash
When Iteras, the Spark Wind enters the battlefield, you may cast target instant or sorcery spell from your graveyard this turn without paying its mana cost as though it had flash. Then exile that spell.
{2}{w}{u}{r}: You may cast any number of spells this turn from exile without paying their mana costs. At the end of your turn, exile Iteras, the Wind Spark.