MInotaur - Should drop small amount of scrolls for all party members and a large amount for one

 Reasoning: This dungeon is tied to no events or tournaments, to have the energy to spend here is often to essentially give up on any current events or tournaments. This Dungeon shouldn't be as time or energy consuming as it currently is to get what players need.

Shards - Add a 5x summon to all shards

Summon X hero unique events - During these events it would be a lot more sensible to have it so summoning that particular hero has a overall X percent increase. Meaning with a legendary shard your chance to summon any normal legendary is 6% or whatever it is. But your chance to summon hero X is 6%+6% which gives you an overall higher chance to summon her instead of a higher chance within the chance.

This might make those events somewhat worthwhile.

Rebalance champions - Many champions specifically legendary and epic are worthless. Every single champion especially the higher rarity should either be a) Generally good or b) Very good at one specific game mode like arena, or Ice Golem etc.

Go through the lists people have made online and see what champions are considered the worst or never used and work your way up. If you can't figure out how to make a champion generally better than make them a specialist.

Battle Pass - Once completed every 10 point you get will get a chest which contains randomly either a small amount of gems, silver, brews or potions. Nothing crazy just give people a reason to max out early and keep going.

This one is a long shot but, how about improving drop rates ever so slightly?