Blast Zone

Name	Blast Zone
Converted Mana Cost	0
Types	Land
Text	Blast Zone enters the battlefield with a charge counter on it. : Add . , : Put X charge counters on Blast Zone. , , Sacrifice Blast Zone: Destroy each nonland permanent with converted mana cost equal to the number of charge counters on Blast Zone.
Expansion	War of the Spark
Rarity	Rare

Card rulings (?)

2019-05-03	An activation cost of means that you pay twice X. If you want X to be 3, you pay to activate Blast Zone’s ability.
2019-05-03	Tokens that aren’t a copy of something else don’t have a mana cost. Anything without a mana cost normally has a converted mana cost of 0.
2019-05-03	If a permanent has in its mana cost, X is considered to be 0.