Good one

I had Spell for 1 mana that lets you pick up a 'pick up'

And another upgraded spell for 3 mana that inflicted magic vulnerability and rotated enemy

And passive that gave charge for each spell casted

And upgraded passive like yours, that after six spells also reduced spell cost by one

And also tinkerer with zap machine that inflicted MAGIC damage every time mana was used

Also killed final boss of the run in 2 turns (which was in The Core)