The other half to the Eevee-assistants equation.
Umberon is my favorite Eeveelution. It's coolness rivals that of Charizard and Tyranitar IMO.
This MD Umberon was obviously designed to be a bench-sitter, like its counterpart Espeon, but that is by no means bad. Giving free retreat AND Weakness removal is doubling your fun and chances of out-maneuvering your opponent (maybe). Really, it just depends on what you need in-game. If you're playing with Leafeon active and fully powered, but come up against Blaziken or Charizard, Umbreon might be a good idea! Of course, Espeon's +20 HP is just as good if not better in situations beyond that. It really comes down to a choice between the two. I usually play both in my deck and end up picking one to play during a match depending on the conditions.
Umbreon's attack isn't too good. Yes, Upper could help but 50 damage plus an easily removable condition isn't that great. Emergency purposes only please.
Modified: 6/10 (Honestly, no Eeveelutions deck should be without Esp and Umb should it ever become powerful enough to compete in the popular metagame)
Limited: 5/10 (Could be useful...but not likely. The other Eeveelutions fare better here with more potent attacks and effects)