Well, they do a lot of different things
Since Nethersoul Dragon has the broad requirement of any two Zombie Monster and Zombie Monsters have a knack for winding up in the Graveyard, adding just a single copy of Dragons Mirror gives you an easy way to bring out a 3,000-attack-point monstrosity
Because the draw trigger only fires at 7 or fewer, you want cards with immediate value, not cards you park in hand
The biggest aspect of this dungeon is the progression of rooms
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Early game, getting lands is really good and you are filtering them out of your deck