pelgranepress.com
If you like superhero games I'd look at Icons - we use it as a failover game when we can't get a quorum to attend our sessions and it's great for episodic play. The supers genre in general plays fairly well episodically IME, but a lot of supers games are very mechanically crunchy and aren't as suitable for pick-up games unless the players are all really into learning new systems. Icons is traditional and "crunchy" enough that everyone in my group is on board with it but lightweight enough that nobody feels like they have to learn an entirely new system. Don't know how it works on Foundry - we play over Roll20 but we don't use anything special with it (we use Google Docs for character sheets).1) A game that doesn't require specific party roles to function properly. [D&D and adjacent games require a lot of work if you're missing certain character classes.]
2) Something built for episodic, beer-and-pretzels play. [I'll lose them on deep mysteries.]
3) Works well on VTT (especially Foundry)

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.