Minecraft
Minecraft on Switch seems like the most obvious choice you could possibly hope for, and fans have been waiting for just that for years. Due to the open-ended, creative nature of the game, amiibo would be a good way to just enhance the creations and option you already have.
Obviously, new skins for your characters is a great idea, letting you play as Mario, Marth, Samus, and whatever other Nintendo characters you want to. However, maybe amiibo can do more than that, rewarding you with exclusive pre-made buildings or items. You could also use them like Breath of the Wild, where tapping an amiibo drops valuable items or crafting materials for you to use, cutting down on the need to go harvest things.
Seeing as the possibilities in Minecraft are nearly limitless, there’s so much that you could do with amiibo figures. Honestly, it’s kind of surprising the game hasn’t gotten some kind of support already.