Myr Battlesphere
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
This printing
Prices
You choose the value for X as the last ability resolves. You can't choose a value for X that's greater than the number of untapped Myr you control.
As the last ability resolves, you can tap untapped Myr you control even if Myr Battlesphere is no longer on the battlefield by then. If that has happened, Myr Battlesphere won't be able to get the +X/+0 bonus, but it will still deal X damage to the appropriate player or planeswalker.
You can tap any untapped Myr you control as the last ability resolves, not just the Myr tokens you created with the first ability. This includes Myr that haven't been under your control since your most recent turn began.
Printings (16)
Foundations Commander
Secret Lair Drop
Tarkir: Dragonstorm Commander
Modern Horizons 3 Commander
March of the Machine Commander
Phyrexia: All Will Be One Commander
The Brothers' War Commander
Commander 2021
Double Masters
Commander 2018
Commander Anthology Volume II
Duel Decks: Elves vs. Inventors
Commander 2016
Commander 2014
Commander 2013
Scars of Mirrodin
