Pursuit of Truth

When Pursuit of Truth enters the battlefield, Investigate.
Whenever you sacrifice a Clue, put a Truth Counter on Pursuit of Truth.
Remove two Truth Counters: Target permanent gains hexproof until end of turn.
Remove three Truth Counters: Put a +1/+1 Counter on target creature you control.
Remove four Truth Counters: Target permanent gains indestructible until end of turn.