Keep your life counter apps handy
Theres a curious thought experiment to be had in trying to review the artifacts that broke previous Standards and consider how they would have fared with colored mana costs (or artifacts in the most recent sets with colorless mana costs)
Once players are familiar with layouts, they can shift to a softer playmat of their own choosing
If a creature that has +1/+1 counters on it receives enough -1/-1 counters to cause it to be destroyed by lethal damage or put into its owner's graveyard for having 0 or less toughness, effects that refer to the counters on that creature when it died will see all of those +1/+1 and -1/-1 counters
I also threw in the more powerful venture cards just to maximize that AFR feel (and our odds of a 2-turn dungeon clear) with the exception of Acererak, who isnt quite as cool when we want to smash out repeated loops of Tomb of Annihilation compared to just one
Zirda, the Dawnwaker While all the companions are powerful, Zirda, the Dawnwaker caught a Legacy ban for its combo potential