Sonic Boom (MP14-EN109) - 2014 Mega-Tins Mega Pack 1st Edition

During your turn: Target 1 "Mecha Phantom Beast" monster on the field; this turn, its ATK becomes double its original ATK, it is unaffected by other Spell/Trap effects, also if it attacks a Defense Position monster, inflict piercing battle damage to your opponent. If this effect is applied to that monster, destroy all Machine-Type monsters you control during the End Phase of this turn. Other monsters cannot attack during the turn you activate this card.