Darnok, End of Days

Flying, indestructible, hexproof
Whenever Darnok, End of Days enters the battlefield, destroy all lands.
Whenever Darnok, End of Days becomes tapped, destroy all artifacts and enchantments.
Whenever Darnok, End of Days attacks, destroy
all other creatures.
Whenever Darnok, End of Days blocks, destroy
all planeswalkers.