This article consists of information that does not apply to the Mario Maker Wiki. The Magic Leaf item (name not official) is a power-up exclusive to Super Mario 3D World.
Magic Leaf (name not official)
Vital statistics
Type Power-Up
Effects Makes the User invincible to enemies
Source Super Mario 3D World
Cost to buy Player must fail a Super Mario World level several times
Cost to sell ...
It makes the user invincible (except from falling) and gives the user the powers of the raccoon power-up. It appears when the player fails a level several times, making the easter egg of showing the player they need to try harder. This item was probably added so the player could eventually clear a level they were stuck on.