Myr Battlesphere [C16 - 263]

Rarity: R #: 263 Creature Type or Sub Type: Artifact Creature — Myr Construct P: 4 T: 7 Rules Text Contains: 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 defending player.