What's been the best-performing card in your sideboard?
Cedric Philips: Keranos, God of Storms. Backbreaking against Blue-White-Red. Plus you can Chord or Pod for it.
Jeremy Dezani: Aven Mindcensor. Made my opponent miss on a Pod activation, then he missed twice more by forgetting about it and cracking fetchlands.
Denniz Rachid: I don't think my face-up Emrakul fooled too many people, so probably Nature's Claim.
Guillaume Wafo-Tapa: Probably Teferi, Mage of Zhalfir. Against blue decks he's game over.