9 cards where the card is tagged “sweeper” and the set is “who” and the cards aren’t reprints and it’s legal in Commander

Crisis of Conscience (Doctor Who #17)
Delete (Doctor Who #81)
Everything Comes to Dust (Doctor Who #19)
Gallifrey Falls // No More (Doctor Who #131)
Genesis of the Daleks (Doctor Who #69)
Impending Flux (Doctor Who #87)
The Day of the Doctor (Doctor Who #121)
The Moment (Doctor Who #180)
The Night of the Doctor (Doctor Who #24)

The message was clear to Sorin—time to search for something else.