This is almost like a delayed Grab Your Sword on a stick
The Commander precons for The Lost Caverns of Ixalan feature the plane's main factions, with Explorers of the Deeps diving into the denizens from down below
Notice how many of those cards have synergy and overlap, allowing me to pursue three themes in a single deck, and I also plan to have a number of generically good cards that I use in many of my decks, such as True Conviction, Mirari's Wake, Seedborn Muse, or Sigarda, Font of Blessings, as well as several cards that I have not used in any of my previous decks, thus far, such as Hydra Broodmaster, Pledge of Loyalty, Camaraderie, Commander's Plate, Behemoth Sledge, Shield of the Oversoul, or Veteran Beastrider
Combine that with a fun game, collectibles popularity, and a good price point, and it really worked
Lets look at some examples: Confront the Past has a mana value of 1, but if you cast it for X=4 then it will have a mana value of 5 (4+1) on the stack