Myr Battlesphere - Commander 2018 #212

Myr Battlesphere

Set: Commander 2018 (C18)
Collector Number: 212
Type: Artifact Creature — Myr Construct
Rarity: Rare
Mana Value: 7.0

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.