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.
NM-Mint Foil - $1.30
Lightly Played Foil - $1.20
Moderately Played Foil - $1.00
Heavily Played Foil - $0.90
Damaged Foil - $0.70
NM-Mint Foil Non English - $1.30
Lightly Played Foil Non English - $1.20
Moderately Played Foil Non English - $1.00
Heavily Played Foil Non English - $0.90
Damaged Foil Non English - $0.70