Enchantment — Aura
Enchant land
When this Aura enters, investigate. (Create a Clue token. It's an artifact with "

, Sacrifice this token: Draw a card.")
Enchanted land has "

: Add two mana of any one color."
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.