Darksteel Reactor

Artifact

Mana Cost: {4} CMC 4

Set: Historic Anthology 1 (HA1)

Rarity: Rare

Standard Commander

Indestructible (Effects that say "destroy" don't destroy this artifact.)
At the beginning of your upkeep, you may put a charge counter on this artifact.
When this artifact has twenty or more charge counters on it, you win the game.

Deck Archetypes

Control Storm

It accumulates charge counters and wins the game at 20, making it a powerful control or storm card with a win condition.