Whenever Briarbridge Patrol deals damage to one or more creatures, investigate. (Create a colorless Clue artifact token with "2, Sacrifice this artifact: Draw a card.")
At the beginning of each end step, if you sacrificed three or more Clues this turn, you may put a creature card from your hand onto the battlefield.
4/8/2016 Briarbridge Patrol’s first ability will only trigger once per combat damage step, regardless of how many creatures it deals damage to.
4/8/2016 Briarbridge Patrol’s second ability looks at the entire turn, even if Briarbridge Patrol wasn’t on the battlefield for some of the turn. It will see Clues sacrificed for any reason, not just Clues sacrificed to their own ability.
4/8/2016 The token is named Clue and has the artifact subtype Clue. Clue isn’t a creature type.
4/8/2016 The tokens are normal artifacts. For example, they can be sacrificed to cast Angelic Purge or targeted by Root Out.
4/8/2016 If you sacrifice a Clue for another card’s cost or effect, such as that of Angelic Purge or Tamiyo’s Journal, you can’t also pay and sacrifice it to draw a card.