Truth or Dare - Symbol (CMB1) from Mystery Booster Playtest Cards 2019, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Mollie Harms
• Card Text:
  Target opponent chooses one —
  • Truth — That player plays with their hand revealed for the rest of the game.
  • Dare — Mill all but the bottom ten cards of that player’s library. (To mill, put the top card of that library into its owner’s graveyard.)