Well, I have to ding them here just a bit
The three strata of monsters each follow a set of general effect guidelines: The Fiend Level 1 monsters have effects that trigger while in the hand, and they react to destruction, attacks and damage, providing bonuses and acting like hand traps
Judge promos are given to Judges as rewards for their work and contribution to the game, such as alternate art versions of Elesh Norn, Grand Cenobite
In particular, this deck is filled with 8 different Resonators monsters with a variety of effects that allows to special summoned them directly from hand, to bring back monsters from the Graveyard or to prevent them or other monster to be destroyed
Some Modern and Legacy decks can cast Ethersworn Sphinx in the 3- to 4-mana range, where it would be a very strong creature