Styxian Labyrinth

When Styxian Labyrinth enters the battlefield, exile the top card of each player's library. Put a maze counter on Styxian Labyrinth for each land card exiled this way.
{4}, {t}: Return Styxian Labyrinth to its owner's hand.
{t}, Remove a maze counter from Styxian Labyrinth: Target player skips his or her next draw step.