This + Red Eyes Slash Dragon is unbeatable. I lost to it and decided if you can't beat it, use it. There's really no solution other than getting lucky and getting 2 canadias, but even after that you need a boss monster stronger than RESD's defense to destroy it.
Slash Dragon loses to Lava Golem burn, Silent Spellbooks (Magician negates Fusion), Desperado (doesn’t target, so Red-Eyes can’t negate) and etc. You either are playing a really bad deck, or just suck if you can’t beat this