Arsenal may be champions for the first time in two decades, but the challenge is staying at the top. So with some huge deals shaping up in the coming weeks, what's the best-case scenario for Mikel Arteta's Arsenal in the transfer market? (Image credit: Craig Williamson/SNS Group via Getty Images)The big one. Julian Alvarez to join in attackJulian Alvarez could be transformational in attack (Image credit: Jose Breton/Pics Action/NurPhoto via Getty Images)As much as Vinicius Jr would change Gooners' worlds, imagine if they could snare Julian Alvarez, too. The Gunners are spinning several plates, here…How Arsenal's squad could look after a dream transfer window…