Tower is unplayable due to overpowered Event cards: 3 1/2 hr session, hp 12200 +/- with 15 losses and 3 wins to all-water with Savage Bitches Epic Water charging 3 gems faster, and Water Upgraded. With everything (not just these) I was League 3/250 yesterday and am now 4/500. Also, 3 more WebGL switching off and crashing.
Apparently I have to run the Dungeon (takes about an hour and I don't bother with Water Mythic) for cards and side quests + free chest for cash until I have enough hp to try the Tower again. Water Mythic has 20,000 hp so I won't bother with the Tower until I have the Mythic card - maybe mid-April at my current rate of play.