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Myr Battlesphere

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 the player or planeswalker it’s attacking.

Rarity : Rare
Types : Artifact, Creature
SubTypes : Construct, Myr
Artist : Franz Vohwinkel
Cost converted to mana : 7

Rulings

1 January 2011
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.
1 January 2011
You can tap any untapped Myr you control as the last ability resolves, not just the Myr tokens you put onto the battlefield with the first ability. This includes Myr that haven’t been under your control since your most recent turn began.
1 January 2011
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 defending player.

Wind-Scarred Crag

Wind-Scarred Crag enters the battlefield tapped. When Wind-Scarred Crag enters the battlefield, you gain 1 life. {T}: Add {R} or {W}.

Loxodon Warhammer

Equipped creature gets +3/+0 and has trample and lifelink. Equip {3}