This Commander costs seven mana and is just a 2/2, but you probably won't ever spend that much to cast him
Unlike most Eldrazi, Sire of Seven Deaths lacks a cast trigger, but its generic mana cost enables it to fit into any color combination as a top-end threat that is incredibly difficult to deal with outside the use of counter magic
Maybe sneak a Quirion Ranger in there too for good measure
Im typically a fan of the Eldrazi decks to pair with my Chalices, but the other lock pieces, specifically Blood Moon, seem especially powerful and well-positioned in the format at this time
To do the best you can, you'll need to work together to overcome the opposition
It's a horrible topdeck to draw late, but the upside is high enough that its worth taking that risk