Dogmatika Theo, the Iron Punch (ROTD-EN006) [Rise of the Duelist]

Cannot be destroyed by battle with a monster Special Summoned from the Extra Deck. You can only use each of the following effects of "Dogmatika Theo, the Iron Punch" once per turn. If a monster Special Summoned from the Extra Deck is on the field: You can Special Summon this card from your hand. You can target 1 face-up monster on the field that was Special Summoned from the Extra Deck; until the end of this turn, this card gains 600 ATK, and if it does, the targeted monster loses 600 ATK.