Which Item Would You Use?

Here's The Deal! A Grand Prix Is Set To Begin That Spans The Globe! Every Mario Kart Track Ever Made! But There Is A Catch! Which Ever Item You Choose, You Will Only Get 10 Of! Golden Mushrooms, Bullet Bills, And Spiny Shells Are Not Permitted! And There Are No Item Boxes Anywhere To Be Found Which Means Items Cannot Be Replenished! Whatever Item You Choose Must Be Rationed Out Carefully!