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
55/130 Parasect
The most basic strategy is simply to choose your colors ahead of time, before you even open your packs
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"
The #1 card is one reason, but the others are simple
This card is likely a reference to Goblin Rock Sled, a weird card from The Dark that also features a goblin having fun but in a much less snowy way