Ongoing Investigation
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.
Illustrated by Bud Cook
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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 Investigation's first ability triggers twice.
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.
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.
