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Indestructible (Effects that say "destroy" don't destroy this artifact.)
At the beginning of your upkeep, you may put a charge counter on Darksteel Reactor.
When Darksteel Reactor has twenty or more charge counters on it, you win the game.
20 turns is a lot, but there are cards that may speed things up, like Dismantle that effectively doubles current charge counters or other cards that help more slowly, like Coretapper, Vedalken Infuser or Surge node