These are my humble suggestions for the next balance changes 
The following cards are lacking (have weak usage rate, and underperforming based on my extensive testing in ulitmate champion).
Tornado
Since the last nerf (not killing spear goblins) Tornado feels unplayable in high elixer decks and its only usage is only from low elixer decks that have a small spell in addition to tornado and they still need to spend extra elixer. I suggest to revert all the nerf or at least make it kill spear goblins. The main issue is the broken pull strength not the damage, so nerf the pull strength and the card will be tuned down but still playable.
Pekka/Evo Pekka
Both need more hp or healing. Evo pekka is somewhat decent only need slight buff. However, the base is very weak, its 7 elixer and always dies quickly on offense and defense before landing the final hit when reaching towers or troops. An 6% hp buff to the base should fix it and its evo as well so this is the ideal buff. But still any other buffs to these two cards will help (for example 0.1 faster hitspeed, more damage, or longer range).
Wizard/Evo wizard
Both the evo and base card have the worst usage rate and are very weak even after the last buff. They basically need more hp and/or shield hp. Ideally an hp buff where the base card can survive prince charge (around 33 more hp) and about 11 more shield hp (survive zap) should fix both cards at once. More hp is essence because it fixes the real issue (being a very fragile 5 elixer card and having stats like dps, range, etc, that are not worth the elixer cost and is overshadowed by other splash cards like executioner and its evo) however, Other options like a 6 tile range, or more dps, or splash radius could be chosen instead.
Freeze/chef tower
Freeze killing spear goblins is the ideal buff because A horde of spear goblins not dying to freeze is a major problem. Any other small buff could work too. Freeze is one of the least effective and popular spells for too long (not killing spear goblins make the spell very not appealing and not worth 4 elixer).
Royal chef is somewhat decent now he is good on offensive pressure but on defense he is way worse that is way people do not use it. A very small hp buff or a quicker cook time (after one chef tower is destroyed) maybe 31 seconds for example should make him more competent compared to other towers.
I hope I was clear on each point, there other suggestions I have, but lets just focus these for now. Thank you very much.
