Absolutely worth a slot
New world order In one of his articles, Mark Rosewater introduced us to the New World Order in their design process: They would make sure that the common cards as they are the cards that new players will have the most contact with will never be overly complex: They should be easy to understand and easy to play with, so as these players become more interested and start buying more packs, they will gradually start having contact with rarer, and more complex cards, making the learning curve less steep
Cards like Polluted Delta, Flooded Strand, and Scalding Tarn made mana fixing way smoother and let 3- to 5-color decks run like theyre on rails by finding lands with the right basic types, including your best dual and shock options
Furthermore, things that wont migrate include: unopened packs and items, currency, avatar items, friend lists, and decks youve made
Read More: The best Dragons in Commander 10 Rhystic Study Rhystic Study is an excellent card, and its probably the one on this list that you should include in decks even when you arent trying to annoy people