(2/29/2020) You can open booster packs that contain cards not legal in the format you're playing.
Looking at my cube, there is critical mass for: Goblins (R) Humans (all) Warriors (WBR) And, with some effort, other tribes could get critical mass running only cards that are cubeable by themselves, keeping the Poison effect to a minimum: Soldiers (W) Wizards (U) Shamans (RG) Vampires (B) I'm fine with dedicating 2-3 slots per color so each of these tribes have a Lord or some other linear effect as a nod to play them (Goblin Chieftain, Champion of the Parish, Chief of the Edge) but I don't want this cube to be mainly tribal, just have an extra layer of synergy that cares about the creature type line at a low opportunity cost
This leads to an intense rivalry and battle between the two, leading to some truly epic battles, as well as one of the most harrowing scenes in all of video games (seen below)
For what its worth, Amazon took an unprecedented measure for Disney Lorcana: Rise of the Floodborn
Card Details Set The List (PLST) Rarity uncommon Colors R Artist Lie Setiawan Collector # AFR-169 Pricing USD $0.20