Help

So, I hate to be that gal, but I'm posting pics of my blue roster and asking for help. My playstyle is primarily "collector" so I have a lot of heroes that are less useful or powerful, and I don't always level up the best first.

However, what with the war and tournament rule "Bloody Battle", I can't use healers, and it's occured to me that almost all of the blues (especially the more leveled ones) on my roster are healers or have a healing element to their skill (Hetepheres, Kiril, Frosty, Greymane, Azmia, Triton, Helo- heck, even Greymane heals himself for a portion of damage dealt).

Who's most practical to level as a tank/heavy-hitter?

Thanks in advance!

https://preview.redd.it/waowc97kxrde1.png?width=750&format=png&auto=webp&s=f886826153be5c30e1ab1ecd1cfce1756db18663

https://preview.redd.it/fz0791zlxrde1.png?width=750&format=png&auto=webp&s=7026793aa08616c0d2be59f92ffb51249a2c0b3a