Sengei, Unsuspecting Visitor

Flying
When you cast Sengei, Unsuspecting Visitor,
you may return target instant or sorcery card
in your graveyard with converted mana cost
less than or equal to the amount of {u} spent
to cast Sengei to your hand. You may cast an
instant or sorcery card from your hand without
paying its mana cost if its converted mana
cost is less than or equal to the amount of {r}
spent to cast Sengei.