Besides special promotional cards of different series which has been happening since the late 2010s, you'll be hard pressed to find any direct movie, TV, video game, political, or really any other sort of real life figure in an expansion
This list also has a bit of a graveyard sub-theme, which makes the classic Commander card Havengul LichHavengul Lich a perfect fit for the 99
Even 1 damage dealt to a creature from a source with deathtouch is considered lethal damage, so any amount greater than that will cause excess damage to be dealt, even if the total amount of damage isn't greater than the opponent's creature's toughness
When she attacks or ETBs you can toss a +1/+1 counter on your dork, and then encountered stuff triggers the Bident effect
You could also go in a completely different direction and use Experimental Frenzy in service of cards like Kefnet
Im a fan