Essentially, Ruby/Steel focuses less on gaining Lore traditionally and more on Challenges
It's both the best since Treasures are superior to ramp right now and double able with Doubling Season and the worst since it's an answerable dork and in black so harder to play in Commander due to color identity
In addition, some degenerative things can happen if you have too many cards that don't require mana to cycle
For Rares, Exploration, Worldly Tutor, and Birds of Paradise are all staples and great reprints this go around
Versatile Use: Besides card storage, it can also be used for various other sundries, making it a multi-functional storage solution
3 Tana, The Bloodsower Tanas ability is very simple