mtg forgotten realms commander deck lists 3 Adventurous Commanders in Adventures in the Forgotten Realms

The article from IGN doesnt clarify whether these new cards from the Scene Boxes will be available anywhere else, but it is likely that normal versions of these cards could appear in booster packs of the sets Holiday Release

Heartless Summoning If youre playing big creatures, whats better than paying 2 mana less for each one

Progenitus Size 8.8cm x 6.3cm, Fit perfectly into KMC perfect fit sleeve

As for our mechanical friends that introduce Prototype with The Brothers War, there are 18 in total (four mythics, three rares, six uncommons, and four commons) and appear in all five colors, so youve got your pick of options