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The Mystic duo are both 4-drops with flash and 2 toughness and counter a spell on arrival to the battlefield
You can use existing deck recipes (the ones you can load, anyway) as templates, add or remove monsters or Spells or Traps Or you can have fun and make Decks whose sole purpose is to bring out some monsters that are infamously difficult to summon (and which, sometimes, just arent worth the effort)
Banlist History Restriction changes recorded for Meklord Emperor Granel
So what tends to happen is that eager beavers will trade for a couple of pieces from some exciting new deck (generally right after they see it perform well on stream and the prices are at their highest) only to give up once they realize, holy mackerel, Vengevine is itself a $50 card and Leyline of the Void is up to $60 and you need a playset of Arid Mesa and wait, how much is Blackcleave Cliffs these days
destroy all of your opponent's monsters in the same columns as your "S-Force" monsters