It stands out from the rest thanks to a ton of unique digital-only cards that often have random effects, manipulate your deck in ways that you wont be able to otherwise, and the ability to just make cards appear from thin air
It guarantees a hand of 7, which is essentially a much-needed refill for an archetype that can quickly empty its hand
The Most Competitive If I had to choose one of the decks to upgrade to a competitive level, itd be either of the tri-colored ones
Number 109 Language English Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Timeless, Vintage Not Legal Formats Alchemy, Pauper, Standard Rulings (6/15/2010) Training Grounds won't affect a cost that isn't the cost to activate a creature's activated ability
Selling ungraded cards can also be a profitable as many collectors are looking to cop potentially near-mint cards, have them graded, and potentially turn a profit