This Mario papercraft is Boomerang Flower, a power-up that appears in Super Mario 3D Land for the Nintendo 3DS, the paper model was created by squeezycheesecake. Boomerang Flower transforms Mario into Boomerang Mario, similar to Hammer Mario.
They can be found lying on the ground, inside of ? Blocks, and after defeating some Boomerang Bros. After obtaining it, Mario can throw a boomerang to defeat enemies and reach items from a far distance. However, Mario can only throw one boomerang at a time and is forced to wait for his first boomerang to return or disappear before throwing another. This power-up first appears in World 5-1. [Source: Mariowiki]
You can download this mario paper craft model here: Super Mario 3D Land - Boomerang Flower Free Papercraft Download