茨(いばら)橋(ばし)の巡(じゅん)回(かい)兵(へい)

Whenever this creature deals damage to one or more creatures, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.")

At the beginning of each end step, if you sacrificed three or more Clues this turn, you may put a creature card from your hand onto the battlefield.