Blast Zone
Oracle 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 cost equal to the number of charge counters on Blast Zone.
Yeah, I like how it has "nonland" because of Vampire Hexmage and friends. (And to a lesser extent, Imprisoned in the Moon, Song of the Dryads, Arixmethes, Slumbering Isle, and the flip lands from Ixalan block.)
I get your point though. It is not technically impossible to get the explosion zone to zero counters, as the only way to do this in standard is through exactly Sylvan Awakening or Clan Guildmage, followed by Suncleanser.