Necropotence with Dark Ritual was a defining feature of the format and very difficult to stop without the full suite of turn-1 free countermagic available to Magic as a whole
Kazandu Mammoth / Kazandu Valley Kazandu Mammoth is a beefy creature played in stompy decks, and together with fetch lands, you can have a 7/7 attacking on turn 4
[Counter] If you have 4 or more Events in your trash, up to 1 of your Leader gains +4000 power during this battle
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In addition, the Pokemon Company has announced 30th Anniversary Premium Deck set, featuring Eeveelutions Espeon and Umbreon, will also release on the same day
Flavor-wise, black cards show the boundaries you'll push in order to obtain power and achieve your goals