Maelstrom Whirlpool

Maelstrom Whirlpool enters the battlefield tapped
{t}: Add {u}{b}{r} to your mana pool
{10}: Target player puts the top 10 cards of their library into their graveyard, for every land that enters this way play a land card from your hand until end of turn
"Deathwing's Cataclysm is eternal"