Scrap

Scrap Monster

The Scrap monsters are an EARTH-Attribute, and are used by Toru in Yu-Gi-Oh! 5D's World Championship 2011: Over the Nexus. In spite of their appearance and name, almost none of them are Machine-Types except for "Scrap Hunter", "Scrap Mind Reader", "Scrap Breaker" and "Scrap Recycler".
Scraps focus on destroying themselves and each other by the effects of "Scrap" cards, including Spell and Trap effects. Some of their effects destroy cards on both sides of the field, and some trigger even when destroyed by opponents' cards, generating advantage from what would normally be crippling. Here is a list of all "Scrap" cards and their relevant explanations. "Scrap Kong" and "Scrap" Tuner Monsters, except "Scrap Mind Reader" can add another "Scrap" Monster from your Graveyard to your hand when they're destroyed by card effects of "Scrap" cards, even their own effects.

source: wikia