He just makes everything bad
For the most part, amiibo are used to add small features to games, bonuses that just make everything a little easier. For instance, Hyrule Warriors uses amiibo to grant a spinning attack and to offer some extra weapons. It’s nothing that’s really significant, but it’s nice to have.
The Twilight Princess remake looks as if it will have some amiibo functionality that’s downright detrimental. Nintendo Inquirer is reporting that using the Ganondorf amiibo will cause the game to deal double damage. It makes sense given that Ganondorf is the series’ long-standing antagonist.
At least the other amiibo are rumored to have positive properties. It’s said that Link and Toon Link refill arrows, while Zelda and Sheik have healing effects. Wolf Link will have the greatest impact of all, as it adds an extra dungeon to the game, eventually rewarding the player with a wallet that holds 9,999 rupees. Unfortunately, that extra in-game money will be of no use to you in your pursuit to buy even more amiibo.
Twilight Princess HD’s amiibo functionality leaked [Nintendo Inquirer]