Hymn of the Apocalypse

As an additional cost to cast this spell, discard X
cards, or pay X Life, where X equals the
number of lands you control.
At the beginning of your upkeep, put a finality counter on Hymn of the Apocalypse.
When Hymn of the Apocalypse has 5 finality
counters on it, destroy all permanents
on the battlefield. This effects permanents that
can't be destroyed as well.