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The card was errata'd in 2017 (a massive 15 years after the card was first printed) with the introduction of Link Monsters to the game, but prior to then, the effect of Darkness Approaches was to flip a monster face-down without changing its battle position
Like the Warhammer 40,000 decks released in 2022, these special releases will be available as 100-card packages and premium collector boosters, though the latter will only contain alternate art treatments and flavourful reprints - every new card can be collected without cracking a single pack
You can only use each effect of "Subterror Nemesis Warrior" once per turn
Geosurge is still good enough to drop a big finisher (Inferno Titan, Wurmcoil Engine, maybe Balefire Dragon if you want to get cute) on turn 4, but that requires having both the enabler and the big creature in your starting 10 -- and remember that contemporary mono-red doesn't really have filtering or card draw
I am getting convinced