This sort of trick can make or break Commander games, especially if one were to place it atop an Isochron Scepter
Memory Jar has also fallen quite far from grace, now typically only being used when it can be abused with Goblin Welder and the new Daretti
You may find that decks composed of cards from the same set may work better together, but the important thing is that if each player has two packs, they can just open, shuffle and play
While not broken, itll help a lot in this build to keep you casting spells
If at the beginning of your end step there are more than 8 cards in your graveyard, the enchantment flips and becomes a 4/4 creature with flying and Crew 1, which allows it to become an Artifact creature until end of turn
You get a ready-to-play 60-card Planeswalker Deck and use it to do battle against others participating in Open Dueling, including players participating in the main tournament who are between rounds