It's rare for formats to be broken these days, but when it happens, it's probably because Team CFB/FtF is playing a great version of a known beatdown deck.
Heading into Day 2, their team looked poised for a pile of huge finishes. Several teams had the shell, but Simian Spirit Guide and Chalice of the Void are huge gains. It protects you from Affinity, Infect, and Burn to some degree, and those were the biggest decks at the Pro Tour.
Protecting your Thought-Knot Seers and Reality Smashers from Path to Exile is also a huge deal. When you're eschewing black for all colorless cards, there's some give and take. You no longer have access to disruption in the form of Thoughtseize, so Chalice of the Void is necessary.
Ratchet Bomb and Spellskite fill out the decklist and shore up the weaker matchups. You have some leeway with the manabase, as there are plenty of cool colorless lands to play with. Blinkmoth Nexus and Mutavault add to the aggressive theme.
Ghost Quarter gives you some fight against Tron, the mirror, and opposing creature-lands. The Wastes give you something to search for against Path to Exile and Ghost Quarter and they allow you to cast your colorless creatures under Blood Moon.
I'm not sure how Modern is going to react to this deck, but right now, it's public enemy number one.
- 2 Spellskite
- 4 Eldrazi Mimic
- 4 Endless One
- 4 Matter Reshaper
- 4 Reality Smasher
- 4 Simian Spirit Guide
- 4 Thought-Knot Seer