Im trying to make a Demise otk deck and i dont understand why people run doom dozers and metal armored bugs?

u run advanced, demise, use advnced on metal armored, or 2 insect knights, nuke the field, remove 2 insect knights to summon doom dozer, then megamorph, or play swing of memories on metal armored, then megamorph, or summon calculator with either of those monsters on the field