Nerf Vulcan, LMG

Equip {7}{r}
When Nerf Vulcan, LMG enters the battlefield, deal {x} damage, where {x} is the {x} in the mana cost.
{t}{x}deal {x} damage to target planeswalker, where {x} is the mana cost for this ability.
{t}{x}deal {x} damage to target creature, where {x} is the mana cost of this ability.
Target nonland permanent this is attached to gains +7/+7