It will support your artifact strategies, whether that's playing constructs or equipping creatures, or you just need an outlet to sacrifice artifacts
Team Up has 196 cards in total (181 main set cards plus 15 Secret Rares)
Its shining bright artwork pops so well in ultimate rare form, and with it being the Dark Magician equivalent that actually has a high rarity, it's undeniably the most valuable GX card ever and one of the most valuable cards in all of Yu-Gi-Oh!

These are the most valuable cards in the set as of March 15th, the day after the set released: Cynthia's Garchomp ex (SIR): 27,000 to 33,000 yen Ethan's Ho-Oh ex (SIR): 17,000 to 22,000 yen Ethan's Adventure (SIR): 7,000 to 9,000 yen Cynthia's Garchomp ex (Gold): 5,000 to 6,700 yen Ethan's Ho-Oh ex (Gold): 4,000 to 4,800 yen Misty's Psyduck (IR): 2,500 to 3,000 yen Yanmega ex (SIR): 2,400 to 3,000 yen Arven's Mabosstiff ex (SIR): 1,700 to 2,400 yen Ethan's Typhlosion (IR): 1,600 to 2,000 yen Lavencia (Gold): 1,200 to 1,800 yen Cynthia's Garchomp ex (FA): 1,400 to 1,700 yen Ethan's Ho-Oh ex (FA): 1,200 to 1,500 yen MC's Hype Up (FA): 1,200 to 1,500 yen Cynthia's Roserade (IR): 1,000 to 1,500 yen Ethan's Adventure (FA): 1,000 to 1,400 yen At #6, Misty's Psyduck is more valuable than some of the set's SIRs and gold cards
A few English reprints have upgraded rarities, such as Kirlia and Primeape (going from common to uncommon) and Mabosstiff (from uncommon to rare)