So scanning any Amiibo in Breath of the Wild will randomly drop some items, and scanning a Zelda-related Amiibos has a chance to drop a specific rare item. These range from the mundane (clothes) to the shiny...
Wait, what? Why do I have a glowing arrow?
Nice! So that's an infinite supply of light arrows (well, infinite until the bow breaks). I wonder if they have any bonus against Ganon?
Speaking of which, Ganondorf has his own shiny item: