Common Omnath builds include multicolor matters, 5-color good stuff, or a devotion route with black devotion a particularly good choice
The final card in today's artist spotlight is Articuno, a holographic rare in the set illustrated by Yusuke Ohmura
-sigh- Commanders emphasis on color identity in deckbuilding has successfully kept Krrik, Son of Yawgmoth from being a huge problem in the format as a whole, but its still a powerhouse that should be removed or countered on sight against decks with a large or exclusive emphasis on black, as 4 mana can easily become as much as 16, more if life gain enters the equation
For example, if it's discard, countered, or destroyed, it's put into your graveyard, remaining in the game
In fact, outside some infinite combos that instantaneously mill libraries, it's actually quite hard to win in Commander via mill