Kerphoth, Puppet Master

Hexproof, Indestructible.
This creature cannot attack or block
When you cast Kerphoth, Puppet Master, permanents that can't be targeted can be targeted this turn.
When Kerphoth, Puppet Master enters the battlefield, gain control of target creature until Kerphoth, Ancient Blood leaves the battlefield. That creature gains "Whenever this creature attacks or blocks, put a plot counter on Kerphoth, Puppet Master."
Remove five plot counters from Kerphoth, Puppet Master: Target player loses the game.