Art for the Cardmaster Conflict card Gunpowder Stockpile.

Somewhat of a misnomer, given that it's mostly TNT, which is a different type of explosive.

This was a bulky wall card, that could be detonated to damage all of your opponent's monsters, but only if it was suffering from a burn. Burning your own things was an awkward enough hurdle that nobody played the card, but it was doable.