Whenever you cast an artifact or creature spell using mana produced by Barracks of the Thousand, create a white Gnome Soldier artifact creature token with "This creature's power and toughness are each equal to the number of artifacts and/or creatures you control." Barracks of the Thousand's triggered ability will resolve before the spell that caused it to trigger
Play Boosters are balanced for Limited play, perfect to open just for fun, and contain at least one foil card and one Retro frame card
The Gitrog Monster + Underrealm Lich You need to build around the combo of The Gitrog Monster and Underrealm Lich for it to work
Incendiary Dissent: Another color restriction
Dominaria United with the stained glass artwork, in MUL cards, the list goes on
Well, its a common, and very easy to justify