I would like this experimentative magic - specially when the risk of backfiring increases.
Example: I use this freezing meteorstrike - as the monster has resistance against this -> my party gets the damage. In order to avoid this, "Know Creature" would be more vital.
Or I mix spells and lack the lvl/intelligence for this => strange side effects
Or, I enter an area of wild magic => spell effects turn into the opposite.
I think, this could be a way to avoid balance issues.
Kiya