I unlocked the tower over the weekend, and promptly found myself struggling to get past the 3rd floor. I had only 10 heroes unlocked, but another 10 I could summon (I read that waiting for a full unlock meant all saved tokens immediately go towards the next star level, thus making it a more efficient way, if very slow, to accumulate stronger heroes).
Read through some thoughts here, and it seemed like the best thing to do was to summon as many heroes as possible, run a cannon-fodder team to soak up the special attacks, then clean with my main team (Bramble, Zurk, Nub Nub and Stonefist - use taunt and goblin abilities = tons of health and long term survivability, usually make it through the clean-up round with 0 damage). I am now on the 9th floor, with my main team the only guys left; they'll probably win through that round, but die on floor 10 (they're facing a L31 3star ascended MK, so .. . umm, yea).
Currently have 23 heroes unlocked - should I expect to complete the tower every day right now? How many heroes should you expect to go through? The upper levels are all L31s, ascended with 3 stars (essentially L37s), while my teams are almost all 2 stars and ascended L29s. I'm using this event to bring Zurk and Nub close to their 3rd stars (just discovered the purpose of those event tickets today, oops, haha).
Since the tower scales with player level, it seems impossible to keep a roster strong enough to even be cannon fodder; I try to get my new heroes up to my player level, just so they have the HP/D to survive that first round (nothing worse than having the very first attack-all special wipe your team out).
I've read in the PvP section that the Tower is crucial for resources, namely stamina and gems, but it seems like you need a ton of resources to be able to compete in the Tower in the first place? What's a new guy to do?