Rail Cannon Gustav Max

XYZ Cast 2 (You may cast this card from your sideboard using X creatures of this cards converted
mana cost as materials, they do not go to the
graveyard)
{3}, {t}: Send 1 material to the graveyard, deal
5 damage to every opponent.
—
"The base has been getting shelled for a week.
We set out a few days ago and still haven't found
the source. "-A Weary Soldier