Day of Judgement

(You may cast a legendary sorcery only if you control
a legendary creature or planeswalker.)
Split second (As long as this spell is on the stack,
players can't cast spells or activate abilities that
aren't mana abilities.)
Destroy all permanents. Each player searches
their library for up to 7 land cards, reveals them
and puts them onto the battlefield tapped. Then
exiles all but the top card of their library.