End of Days

End of Days enters the battlefield with 4 time counters on it.
Whenever you remove 1 or more time counters
from End of Days, sacrifice a creature with power
or toughness greater than or equal to the amount
of time counters remaining on End of Days. If
you can't, sacrifice End of Days.
When you remove the last time counter from End
of Days, destroy all other permanents except for
lands you control. Then, exile End of Days.