Battle Mammoth Two Green mythics back to back
Italian Evocazione Sestetto Bandisci dalla tua mano, Cimitero e/o Terreno scoperto 6 mostri (1 ciascuno di Rituale, Fusione, Synchro, Xyz, Pendulum e Link), ognuno con lo stesso Tipo originale, poi Evoca Specialmente dal tuo Deck o Extra Deck 1 mostro con lo stesso Tipo originale di quei mostri banditi
To avoid this, do not save your progress once you discover a bad egg in your party
Snake-Eye Snake-Eye is an aggressive combo deck that can summon a bunch of monsters at once and deal with opponents' monsters in a very interesting way
One interesting question with GU is how much countermagic you should play
The cheaper of the two is Eternatus V DAA 116, running at just over $4 right now, giving you a big-hitter that can deliver over 120 damage in a single attack (or 240 damage if your opponents Pokmon is a VMAX)