The Final Maelstrom

The Final Maelstrom enters the battlefield
tapped.
{t}: Add {c}
{t}, Exile all The Abyss Blessed Lands in
your deck, on the battlefield under your control,
in your hand, and in your graveyard: Deal X
damage to target player, Where X is the number
of The Abyss Blessed Lands exiled this way.