UB Control (Pioneer) [Revisión 30]

UB Control, you have removal and counterspells suite at your disposal as you dig through the deck or put a brake on your opponent with Narset and Deluge and Dig for answers and aquiring your threats. The addition of Sheoldred's Edict is a boon to us to hit stuff we'd have a hard time answering efficiently otherwise and without giving concessions in certain MU's.

4 sweepers (vs weenies) in main deck because of aggressive local meta. Skillful use of Thoughtseize can make or break your matches. Cling to Dust is versatile enough and can come in handy versus reanimator style decks especially.

The "inevitability" is to stick Teferi or Liliana on the board or the Gearhulk, all backed up by your card advantage and responses, or lastly Shark Typhoon when necessary.

General sideboarding strategy:

vs "aggro": Swap out your Jwari Disruption and probably the Negate and/or Sabotage; board in Kalitas and Sheoldred, then the Blue Twilight and/or 2nd Ritual of Soot depending on the type of aggro deck. (Blue Sun's Twilight can steal Fable of the Mirrorbreaker's Goblin token for UU, or you can steal other creature as mana allows)

vs GY-based decks (like Greasefang Vehicles or Izzet Phoenix): Ashiok and Go Blank will be needed here. Cling to Dust main will remain.

vs control: Take out the sweepers and at least 2 Fatal Push (probably all of them or you won't be able to fit in more Sideboard tech); swap for the remaining Thoughtseize, Go Blank, Sheoldred, counterspells and/or Hullbreaker Horror.