Re: Rules you ignore/alter.
I dispense with Regrowth, deciding to make it an automatic feature of Regeneration unless you limit Regeneration.
I dispense with Unaging, simply making it an Immunity.
I base the difficulty of the Time Travel spell in Magic on how precisely you want to target your destination. Thus it's easy to visit the dinosaurs if you're into that but fantastically difficult to travel to last minute.
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