Briarbridge Patrol
Whenever this creature deals damage to one or more creatures, investigate. (Create a Clue token. It's an artifact with "
, Sacrifice this token: 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.
Illustrated by Greg Opalinski
This printing
You can't sacrifice a Clue to pay multiple costs. For example, you can't sacrifice a Clue token to activate its own ability and also to activate Alquist Proft, Master Sleuth's ability.
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.
Clue is an artifact type. Even though it appears on some cards with other permanent types, it's never a creature type, a land type, or anything but an artifact type.
If an effect refers to a Clue, it means any Clue artifact, not just a Clue artifact token. For example, you can sacrifice Wrench to pay for Alquist Proft, Master Sleuth's activated ability.
Briarbridge Patrol's first ability will only trigger once per combat damage step, regardless of how many creatures it deals damage to.
