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.
![Myr Battlesphere (Retro) [The Brothers' War Commander]](http://paradoxtcg.com/cdn/shop/files/66e66d1f-2457-53ea-b44c-a12994ce0355.jpg?v=1739376089&width=1445)
