Koschei, First Lich

Koschei, First Lich enters the battlefield tapped.
Indestructible, Hexproof
{t}, Exile a card from your hand: Put an eon
counter on Koschei, First Lich. Skip your
next turn.
{t}, Remove an eon counter from Koschei, First
Lich: Take an extra turn after this one.