Buy @ TCGplayer
Blast Zone enters the battlefield with a charge counter on it.
{T}: Add {C}.
{X}{X}, {T}: Put X charge counters on Blast Zone.
{3}, {T}, Sacrifice Blast Zone: Destroy each nonland permanent with mana value equal to the number of charge counters on Blast Zone.
An activation cost of {X}{X} means that you pay twice X. If you want X to be 3, you pay {6} to activate Blast Zone's ability.
If a permanent has {X} in its mana cost, X is considered to be 0.
Tokens that aren't a copy of something else don't have a mana cost. Anything without a mana cost normally has a mana value of 0.
