Myr Battlesphere (C14) #254 [EN/N]

{7} · Artifact Creature — Myr Construct · 4/7 · 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. · Illustrated by Franz Vohwinkel · Commander 2014 #254 · EDHREC rank 889 · Magic: The Gathering, MTG