Byway Courier

two generic mana one green mana Creature — Human ScoutPower and toughness3/2

When this creature dies, investigate. (Create a Clue token. It's an artifact with " two generic mana , Sacrifice this token: Draw a card.")

A good courier travels fast and asks no questions.

Showing Shadows over Innistrad#196

Price

0.03 $

Foil 0.31 $

19 printings · up to 0.40 $

Daily estimate from Scryfall, not a shop quote.

2016-04-08
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.
2016-04-08
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.
2016-04-08
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.