So far, I only have IM and SW to red thanks to the civil war xp bonus event.
I have all my current heroes at 60 so I have a 105% synergy as well. I was wondering if now would be a good time to get some of my heroes to red, mainly Spidey, Deadpool, and maybe Doom. I don't have any experience potions apart from the blue cupcake and 50% cups, but I do have about 350 cube shards which I can spend on cards and hope for xp potions. Would it be worth it to spend my shards on cards or should I be saving them for something else? Also, would this week be the best week to prestige some of my heroes to red?