Lamb Schrader, Investigator

While Lamb Shrader, Investigator is on the battlefield, no counters can be placed on any
permanents. Exile any permanent that attempts
to place counters before they resolve.
{t}: Return an exiled permanent to the battlefield
under its owner's control. Scry and Investigate X.
Where X is the permanent's converted mana cost.

You can sacrifice Lamb Schrader, Investigator to activate all clues without paying their mana costs.
I'm already dead. -Lamb Schrader