Goblin Siege Tank

Trample
{t}: Goblin Siege Tank deals 5 damage to target creature or player. Activate this ability only
while Goblin Siege Tank is an artifact creature.
Goblin Crew 4 (Tap any number of Goblin creatures with total power 4 or more: This Vehicle becomes an artifact creature until end of turn.)
"Give 'em a taste of the main gun, boys!"