Scars of Mirrodin :: Myr Battlesphere

Eratta

Artifact Creature — Myr Construct
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.

Other Releases

Commander 2016
Commander 2014
Commander 2018
Duel Decks: Elves...
Commander Antholo...
Commander 2013