It won't. Amiibos are not like lootboxes at all. The closest it can be compared to is DLC. Except that Amiibo is a toy, it can be used across multiple games and that most of the time it unlocks a cosmetic thing. And even when it unlocks a hard mode, Amiibo is "what you see is what you get", different from lootboxes that you have to keep buying to get what you want.