Seven mana is steep when cheap, fast aggro decks are taking you down, but Ugin tends to stabilize most boards
Although the interaction against Omnath, Locus of Creation have dramatically increased with Solitude, Fury, Subtlety and Unholy Heat, the card still is extremely hard to deal with and often wins on the spot
Black also has plenty of removal for dealing with whatever your enemy is up to
If your answer can also attack for two turns, it sells
Deciding to Mulligan Lets begin with how to mulligan against an unknown opponent
The threat of a huge burst of damage on the way out makes this a shocking rattlesnake, and one you should deal with before it even starts to charge up