Cthulhu, The Great Dreamer

Defender, Indestructible
When Cthulhu, The Great Dreamer enters the battlefield, you may play R'lyeh, Tomb of Cthulhu
from your library, hand, or graveyard.
{t},{x}, Distribute X Insanity Counters amongst all creatures on the battlefield, where X is the amount
of mana spent this way.
When R'lyeh, Tomb of Cthulhu is sacrificed by it's
own effect, transform Cthulhu, The Great Dreamer.