Guys, use War Rock to farm him. Not giant arm, but instead, his cards that can destroy something with effects is annoying. But war rock has floating effect to summon their high-level monster if he managed to destroy your lvl 4 WR monster and their boss monster cannot be destroyed by card effects. The rest is just keep destroying his def mode monster with fortia to thin your deck, search something. How expensive this deck? = It's quite cheap. You don't need to reset box, the rest is just your usual set of farming cards: Gravekeeper's Vassal, union attack. Use secret pass for direct attack but I don't even use that card anymore. Instead, I often use photon papilorative (that rank 4 LIGHT warrior) for change battle position to ATK mode or pentestag for piercing. Hope this help.