The only down side that I've found so far is, being able separate out which foils you have or don't have in your collection
Hausarztpraxis Hausrztliche Versorgung und Arztpraxis mit internistischen und allgemeinmedizinischen Schwerpunkt sowie Familienmedizin der Gemeinden Gnnheim und Friedelsheim
You can effectively get rid of a character or draw two cards, both great outcomes for you, and a deal your opponent has to make at the same time
Nearly every card in the deck either gains life, mills an opponent, or counters a spell
Sephiroth, Fabled SOLDIER (who is my most recent Commander deck project) has extremely powerful abilities, and is now a game-changer in Pioneer Sacrifice decks
Its just a little slow to get going, needing you to pull out as much mana as possible in early turns to be able to start slinging those big spells