Gyagosu, the sky's terror

flying, hexproof
whenever you cast an instant or sorcery spell, you
may have it gain flashback until end of turn. Its
flashback cost is equal to its mana value
whenever you cast a spell, if it as lesser or equal
mana value to the number of instant or sorcery
spells in your graveyard and/or in exile, copy that
spell. if its an instant or sorcery, you may choose
new targets for the copy