Post-Armageddon

When Post-Armageddon enters battlefield, destroy
all land. Then player may search from library for
that many basic lands and put it into battlefield
tapped.
Player can't play land.
At the beginner of each upkeep, untap one land
only. The next turn will untap two lands and so
on. If all land is untap, sacrifice Post-Armageddon.