Advanced format ruling
Super Vehicroid - Stealth Union
Card effect (current official text)"Truckroid" + "Expressroid" + "Drillroid" + "Stealthroid"
Once per turn: You can target 1 face-up non-Machine monster on the field; equip that target to this card. While equipped with a monster by this effect, this card can attack all monsters your opponent controls, once each. If this card attacks, its original ATK is halved. If this card attacks a Defense Position monster, inflict piercing battle damage.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.