not sure if you are currently open for taking ideas but here are some I have (you may decide on names and rarity, I will like to hear your opinions)
Spell
Select a Symbol, Replace all other Symbols in that column with copies of the Symbol you selected, Cooldown 4
Increase the damage of all attacks of a Character by 1 this turn, Cooldown 3
Choose an Item that have 50% chance or less of being activated and double its effects for this turn, Cooldown 4
Trinket
Keep half of your shields, purple shields and dodges between turns (Rounded up)
After using a Flask, self heal for 3
All your attacks deal 50% more damage, but you cant use flasks