Flying At the beginning of each end step, if you put a counter on a creature this turn, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.")
原文The last ability triggers only if that opponent controls more lands than you after the land enters the battlefield. The ability will check again as it tries to resolve. If that opponent doesn't still control more lands than you at that time, the ability won't resolve.