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about the icon of lucky 7 this item is found in Mario Kart 7 . when the player has this item it surrounds him/her with 7 items being a : Mushroom , Star , Bob-omb , Blooper , Banana , Green Sheel , Red Shell.
when two or more players Race or Battle with '' Only '' items on, the chances of getting lucky seven are very high when in last place ( sence it will only be that ''Only'' item and lucky 7 available.
For example lets say that the Host of the game put '' Shells Only '' . when you get Lucky 7 you will only get 7 Red shells.