You got almost everything!
- The Magic card is Black Lotus
- The Slay the Spire card is Strike
- Bag of Holding is also from D&D (play mat isn’t necessarily though, they’re pretty ubiquitous in board/tabletop games)
- Rush Universe and the Martian Hospital is Dash Galaxy in the Alien Asylum (referencing this 100th Coin TAS)
- Airlock is Project Airlock, a game I made in college
- Egg of the Eternal Void isn’t anything specific, I just made something up to put the suitcase in.