If you print a 72 DPI image on a physical card, it will look blurry, pixelated, and "cheap." To achieve the crisp, sharp text found on authentic MTG cards, you must design your file at 300 DPI (High Resolution) or higher
One gives one colorless mana, then other has you pay one generic mana to tap and sacrifice Mind Stone to draw a card
This means you have a sacrifice effect in the Command Zone that you can be ensured of getting for your sacrifice matters (10th most-played archetype on EDHREC.com) and Aristocrats (6th) that cares about this ability
Pros and Cons These are super doable challenges just for playing the game, because when I discovered this, I'd already gained enough life to complete the Claws of Bast challenge
Temporal Forces Temporal Forces is a set with real value density especially when you factor in cards that collectors and players want