Prime Minister's Cabinet Room is a common Plane — Earth card from Doctor Who (WHO), collector number 596. Current market price: $0.39, TCGplayer market prices via Scryfall.
At the beginning of combat on your turn, up to one target creature you control becomes a copy of target creature an opponent controls. Will of the council — Whenever chaos ensues, starting with you, each player votes for a creature you don't control. Exile each creature with the most votes or tied for most votes.