Enchantment
Whenever one or more creatures you control deal combat damage to a player, investigate. (Create a Clue token. It's an artifact with "

, Sacrifice this token: Draw a card.")


, Exile a creature card from your graveyard: Investigate. You gain 2 life.
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.