C'Thun, The Old God

When you cast C'thun, reveal the top six cards of
your library. Put any number of Eldrazi creature
cards revealed this way onto the battlefield. Put
the rest on the bottom of your library in any
order.
Whenever C'thun attacks, choose one at random:
•Target player sacrifices half the permanents they control, rounded down.
•Exile the top half of target player's
library, rounded down.