LightPhoenix
First Post
One of my own would be to have a 9th level spell, called Any-spell. It has the spell copying effects of wish and nothing else. Honestly, have a slot to cast any 8th level and lower spell in existence as a 9th level spell once per day is worthy of the slot in and of itself.
Alternatively, Wish as a spell slot is basically "Anyspell" and Wish as a ritual is "Wish." That way the DM can pull out the more powerful Wishes into the realm of story. Additionally, the DM can then play around with stuff like special components, true names, misfires, and other more consequential aspects of the spell.