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.
1/1/2011 You choose the value for X as the last ability resolves. You can’t choose a value for X that’s greater than the number of untapped Myr you control.
1/1/2011 You can tap any untapped Myr you control as the last ability resolves, not just the Myr tokens you put onto the battlefield with the first ability. This includes Myr that haven’t been under your control since your most recent turn began.
1/1/2011 As the last ability resolves, you can tap untapped Myr you control even if Myr Battlesphere is no longer on the battlefield by then. If that has happened, Myr Battlesphere won’t be able to get the +X/+0 bonus, but it will still deal X damage to the defending player.