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You cannot Special Summon monsters from the Extra Deck the turn you activate either of these effects, except "Gimmick Puppet" Monsters

Its a reasonably straightforward deck to play so its great to give to a new player, especially with all the fun flavor text across the range of goblin cards

Dueling Nexus Players, welcome, this deck is called MALICE (Firewall ver).txt

You could play certain missions in the mobile game, then take evidence of that to specific stores to receive these promos

Two of the Mystery Booster: Convention Edition R&D Playtest cards feature new artwork, as seen here

You also get the upside of ambushing some random attackers or saving your team from Crux of Fate if you have spell mastery , so I think there is a chance this shows up in standard, most likely as a one or two-of in control decks (although it might just be overshadowed by the more flexiable Secure the Wastes which can play a similar role)