結界
每當由你操控的一個或數個生物對任一玩家造成戰鬥傷害時,探查。(將一個無色線索衍生神器放進戰場,且其具有「

,犧牲此神器:抽一張牌。」)


,從你的墳墓場放逐一張生物牌:探查。你獲得2點生命。
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.