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.
Near Mint - $0.60
Near Mint Non-English - $0.60
Lightly Played - $0.60
Lightly Played Non-English - $0.60
Played - $0.40
Played Non-English - $0.40
Heavily Played - $0.40
Heavily Played Non-English - $0.40
Damaged - $0.30
Damaged Non-English - $0.30