Manaclysm

{x}: Put X mana counters on Manaclysm.
At the beginning of your upkeep, if there are
100 or more mana counters on Manaclysm, you
win the game.
{10},{t}: Sacrifice Manaclysm. Destroy all artifacts
and enchantments. You select one land that each
player sacrifices. Manaclysm deals X damage to
all creatures, where X is the number of mana
counters on Manaclysm.