A new event for the Pokmon Trading Card Game includes Halloween-themed cards
You can either build around a legendary creature and try to find cards that will complement this creatures abilities (referred as top-down building) or you can build around a mechanic/theme or combination of both that you find interesting and search for a Commander that will best fit to lead the deck (referred as bottom-up building)
Balloon Ride Buddies Pikachu and Eevee float through the sky holding balloons with happy faces
So, I build in ways to use that mana, whether it's activated abilities of Creatures or Artifacts or X spells to use more mana as the game goes on
Online marketplaces such as MTGPrice, TCGplayer, and Card Kingdom are valuable resources
Enchantments and artifacts are the things I, as a Johnny, tended to build around, and Skull of Orm only got me one of them