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 - $560
Near Mint Spanish - $560
Lightly Played - $500
Lightly Played Spanish - $500
Moderately Played - $420
Moderately Played Spanish - $420
Heavily Played - $340
Heavily Played Spanish - $340
Damaged - $230
Damaged Spanish - $230