Myr Battlesphere [Commander 2013] Wall Creatures can't attack you unless

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you

Set: Ice Age Type: Land Rarity: Rare {T}: Add {C}

Set: Limited Edition Beta Type: Sorcery Rarity: Rare Cost: {3}{W} Destroy all lands

Occasionally something surfaced in the thick paste

Bands are blocked as a group

Myr Battlesphere [Commander 2013] Wall Creatures can't attack you unlessSet: Commander 2013 Type: Artifact Creature Myr Construct Rarity: Rare Cost: {7} 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.