The Mind Flayer

When you cast The Mind Flayer, gain control of a creature each other player controls.
At the beginning of your upkeep, create a 2/2 Demodog creature token with deathtouch, then if you control 5 or more demodogs, gain control of target permanent an opponent controls.
Flying, Shadow, Protection from instants.
It knows no discrimination, only assimilation - only death.