N'Zoth, the Corruptor

Defender, indestructible
As N'Zoth, the Corruptor enters the battlefield, if you cast it, gain control of up to eight creatures, then create 8 1/1 black Tentacle
of N'Zoth creature tokens with "When this creature dies, choose a creature you control but
don't own and give control of it back to its
owner." and "When N'Zoth, the Corruptor leaves the battlefield, sacrifice this creature."
"Your essence... is mine..."