Azathoth, Chaos Incarnate

Indestructible, hexproof.
When Azathoth, Chaos Incarnate enters the battlefield, X opponents reveal X cards from the top of their library and exiles them, then exiles X cards from their hands.
{x}{u}{b}{r}{t}: If X is less than 10, X opponents exile their hand. If X is 10 or greater, target opponent reveals X cards from the top of their library and exiles them.