Black has powerful planeswalkers that generate a resource advantage and the ability to trade cards for life, which are traits that midrange decks appreciate very much
That could be Swiftfoot Boots, but also consider Rising of the Day or Urabrask the Hidden
Impulsive Pilferer Impulsive Pilferer makes great sacrifice fodder
Stealing cards or playing them from exile isnt an uncommon mechanic in Gruul, but its the entire theme of the deck which makes for a nice refreshing style of gameplay
Repurposing Bay is a sacrifice outlet to help you fetch artifacts you need
Collecting trading cards has never been a particularly fiscally responsible hobby but, in the current climate where money for entertainment - especially entertainment like trading cards, where you can literally buy a pack and get nothing you wanted - is going to be so limited, Pokmon is making it harder than ever to catch 'em all