Xizut, Lord of the Dark Sea

When Xizut, Lord of the Dark Sea enters the battlefield, destroy all islands and swamps. Shroud, Island-walk Swamp-walk. {u}{u}{u}: put a 7/7 Dark Kraken onto the battlefield, {b}{b}{b} put a 5/5 Sea Dragon with flying onto the battlefield. {u}{b} gain +2/+2 until end of turn. {x}{t} counter target spell with X cost or higher, or discard the top X cards of an opponents deck.