Each time he connects with a players face, that player skips the untap step of their next turn, all but paralyzing them and preventing most of their possible actions
Add on top of that evasion, ward, and getting a +1/+1 each time Valgavoth triggers that card draw, and you've got the perfect commander to build a red/black deck around.
Opponents with decks whose curves extend to seven and play cards at random don't fear the Keg, they just respect it
It includes: Olorins Searing Light, Sorcerous Squall, Rammas Echor, Ancient Shield, Courageous Resolve, Gandalf of the Secret Fire, and Fell Beasts Shriek
Okay, this brings us to nailing down a second color
Interaction A few counterspells help keep people honest when you have blue mana up to potentially stop their game-winning combo, or a pesky battlefield sweeper that will otherwise send your glorious Dragons to the graveyard