Enchantment, 1R (2)
Uncommon
Tap an untapped Gate you control: Crackling Perimeter deals 1 damage to each opponent.
As the path he sought came into focus, Niv-Mizzet took steps to prevent others from approaching it.
Illus. Yeong-Hao Han

1/24/2013: You can’t tap an untapped Gate you control for mana and tap it to activate Crackling Perimeter’s ability at the same time. You must choose one or the other.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Extended (Type 1.X)
Legal in Standard (Type 2)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern