Etched foil has been hit or miss ever since it debuted in Commander Legends
However, it's now seeing tons of play in a different archetype - in Defender decks led by Felothar, the Steadfast or Betor, Kin to All
Non-foil versions of these drops will be available at WPN game stores for purchase at a later date
The Commander product is sold as five separate 100-card decks, each with a three-color Commander (plus two alternates of that same color combination)
Explorer is still too new to get a good pulse on it, so while you can definitely check it out (especially if you're a fan of Pioneer), I'd still suggest sticking to Standard as your main format to start
For the purposes of this guide, stick with Gonti, Canny Acquisitor as your commander