Myr Battlesphere (R) – Commander Tarkir Dragonstorm – Wizards of the Coast from Wizards of the Coast

Description

Myr Battlesphere
Artifact Creature — Myr Construct
When this creature enters, create four 1/1 colorless Myr artifact creature tokens.

Whenever this creature attacks, you may tap X untapped Myr you control. If you do, this creature gets +X/+0 until end of turn and deals X damage to the player or planeswalker it’s attacking.