Its a good as an engine in the early game because it doubles your Zombie count with no real issue or effort, and its good in the late game as a massive threat
Setting up a spot where you can sacrifice Cyan to gain card advantage and make each opponent lose seven life, just to bring Cyan back with Terra is awesome
The eye mouths are definitely screaming too, right
Silas Renn, Seeker Adept, Bruse Tarl, Boorish Herder, and Akiri, Line-Slinger are all cards I could see myself building single decks around
It can also be used as a combat trick, allowing you to spread Auras and Equipment between several creatures, then move them to the ones that weren't blocked , or even to save an important creature by moving your Lightning Greaves onto a creature being targeted by a removal spell.
Mindslaver is basically the only card I am playing that has nothing to do with Sliver synergies