Whenever one or more creatures you control deal combat damage to a player, investigate. (Create a colorless Clue artifact token with " , Sacrifice this artifact: Draw a card.")
, Exile a creature card from your graveyard: Investigate. You gain 2 life.
The tokens are normal artifacts. For example, they can be sacrificed to cast Angelic Purge or targeted by Root Out.
The token is named Clue and has the artifact subtype Clue. Clue isnâ€™t a creature type.
In a Two-Headed Giant game, if you control more than one creature that can attack, you may have them attack different opponents so that Ongoing Investigationâ€™s first ability triggers twice.
If you sacrifice a Clue for another cardâ€™s cost or effect, such as that of Angelic Purge or Tamiyoâ€™s Journal, you canâ€™t also pay and sacrifice it to draw a card.