Myr Battlesphere [Commander 2013]

Set: Commander 2013 Type: Artifact Creature — Myr Construct Rare Cost: {7} When Myr Battlesphere enters the battlefield, create four 1/1 colorless Myr artifact creature tokens. Whenever Myr Battlesphere attacks, you may tap X untapped Myr you control. If you do, Myr Battlesphere gets +X/+0 until end of turn and deals X damage to the player or planeswalker it's attacking.