If the spell has damage divided as it was cast, the division can't be changed (although the targets receiving that damage still can)
If you want to get into making full art alters and proxies yourself, this YouTube video by Commander Smiths is a great starting point
On Earth theyd be giving up noncombatant status, but neither the (old-school) Phyrexians nor the hostile forces of post-apocalyptic Dominaria seem keen on such niceties, so why not
As mentioned by Majors, The Banned and Restricted announcement timing is changing to be optimized for RCQs and widespread competitive play going forward. Nadu, Winged Wisdom will remain infamous for some time yet., but the open communication from Modern Horizons 3s Lead Designer is a positive step towards keeping Magics tournaments free of similar future mishaps.
The same player could also have a Giratina Prism in their deck without issue given theyre different Pokmon
Pack points are only applicable for the expansion you earned them from