Quote from Ashiok »Damping Sphere - obvious sideboard card that people already pointed out, but I'm not sure how good it is. It is basically effective against tron and storm. That's it. Is there another deck that cares about this?
Also good vs all the eldrazi stuff running around again. It will need some testing tron and storm are already good matchups for us but it hoses both of them quite bad. I belive the second effect could also be impactfull against elves at least on the play. That deck lives of chaining a lot of creatures in the first few turns and the sphere taxes any spell. But as long as we don´t get to test its all speculation. If it only was a 2/2 bear with that effect ...
And as others have said vs fringe strategies like amulet titan and green devotion
Edit: also seems very strong vs ad nauseam but that deck also has no big meta share atm