Monumental Destruction

Target opponent loses all {e} counters.
You may destroy two target legendary lands. If
you don't, you may look at an opponent's hand,
then discard a target legendary land. If they do
not have a legendary land, search their library for
a legendary land card, then put it into their
owner's graveyard. If you search a library this
way, shuffle it.
The Citadel's collapsed remains are all that is left of
the once tall and overpowering structure.