Keeper of the Lens

You may look at face-down creatures you don't control any time.

Legalities

• brawl: banned
• commander: legal
• legacy: legal
• modern: legal
• pauper: legal
• standard: banned
• vintage: legal
• pioneer: legal

Rulings

• 2015-02-25:

  Keeper of the Lens allows you to look at face-down creatures you don’t control whenever you want to, even if you don’t have priority. This action doesn’t use the stack.

• 2015-02-25:

  Keeper of the Lens doesn’t stop your opponents from looking at face-down creatures they control.

• 2015-02-25:

  Keeper of the Lens doesn’t let you look at other players’ face-down spells while they’re on the stack.

Links

• Scryfall
• Cardmarket
• Gatherer
• TCGplayer

Printings

• Keeper of the Lens (DTK)