I'm still deciding what I want. I always calculate it at worst case scenario. So if I decide to spend 10,000 diamonds for 500 soccer balls and the losing team, I get 400 balls meaning I can summon Ursula, however, I also want the Hero Choice Chest and Heroic Skins Giftbox, so if they win, the 500 balls become 750 which is more than enough for me to get all 3. So I think that's what I'll do. I don't think I can justify spending more than 10,000 diamonds in this event.
Never Bite The Hand That Feeds You
Current Primary Deck: Nilya, Sylphi, Kong, Malrath, Goram
Current Secondary Deck: Firehawk, Jasmine, Taurus, Tashi, Elric