Both mechanics allow cards to repeatedly leave the graveyard
The first wave of amass cards all created a Zombie Army, but with the addition of amass orcs in LTR, the original mechanic was changed to amass zombies. This allows different sets to represent armies that match the flavor of that set
You can find it more reliably with aggressive mulliganing, but then you run into the issue of having a hand where youre all-in on your one hate card and your opponent has too much time to find an answer or attack with Insolent Neonates
The goal of this deck is to force our opponents' creatures to attack each other, forcing unprofitable attacks that cause their creatures to die and their life totals to dwindle, all while we draw cards and build ever-growing threats
Team Rocket most of all, plus Aquapolis and some Neo a holo pack can land below the non-holo packs
I can't even have a mana cost because it's so long