But if you want to optimize your money spent on your sealed product collection, buy booster boxes for the best pack-to-dollar ratio
The #1 card is one reason, but the others are simple
Dartz, however, is more powerful than the three Swordsmen combined - not only is he able to repel the "Master of Dragon Soldier", a fusion of two of Kaiba's and the Pharaoh's most powerful cards, but is able to expand the full power of "The Seal of Orichalcos", by playing its 2nd and 3rd levels: "Orichalcos Deuteros" and "Orichalcos Tritos"
Ghoulcaller Gisa Though Ghoulcaller Gisa is terribly slow, it's also inexorable
Once the practice sessions indicate that a students achieved fluency, the program will repeat the entire cycle with subtraction, followed by multiplication and division
I think that Niv-Mizzet, Parun is the best of the three because it manages to be a huge threat while also being a soft way to control what your opponents do