Well, I typically think of a Yu-gi-oh! related thing to talk about, but that's besides the point in this case, but instead I'll bring forth a challenge for all of you. Why? Because I think it'll suit the Christmas vibe.
Remember the typical Christmas song: "12 Days of Christmas", so I consider you this: Make a deck that includes at least 1 Level 1, Level 2, Level 3, Level 4, Level 5, Level 6, Level 7, Level 8, Level 9, Level 10, Level 11, and Level 12 monster inside your Main and Extra Deck.
Unfortunately, I won't be able to make that deck until later, because I want to focus on other matters, but I want to mention this: Have a Merry Christmas!