Trying Horus with Gate Guardians is absurd. Any sending monsters (Sanga, Kazejin, and Suijin), spell cards (Riryoku Guardian or Double Attack! Wind and Thunder!), or trap cards (Prey of the Jirai Gumo) to graveyard.
What level were you playing at in Master Duel? Seeing some decks here that defo don't look top tier. DM horus looks OK, but not for anything more than casual fun
@MDNoub yeah you can probably cook quite a few players in Diamond with the deck. It looks real fun and has a strong draw engine with the soul servant addition. I imagine once you start to reach top diamond it may start to struggle... but I hope you prove me wrong!