1-Have the modes unlocked by them beeing unlockable without the Amiibo IE: collect X Starcoins and you'll unlock the mode OR buy this cool figurine that unlocks the mode right away !
2-Have them play modes similar to Splatoon where you only re-play a level with a different weapon/character. this could have fit well with the Shovel Knight Amiibo: buy the Plague of Shadows DLC OR buy this nice figurine that unlocks the Plague of Shadows;
3-release a game that is somewere between Skylanders, Nintendo Land and Wii Sports:
the game itself is 20$ it includes only an improved version of Wii Sports (and Resort) and the main campaign in the key of Skylanders, as it is now, you can only play it with your own Mii but, if you purchase an Amiibo, you can play as that character too AND you unlock an additional minigame in the key of Nintendo Land based off that specific Amiibo.
