Machine King - 3000 B.C. (SBCB-EN197) - Speed Duel: Battle City Box 1st Edition

Special Summon this card as an Effect Monster (Machine/EARTH/Level 4/ATK 1000/DEF 1000). (This card is also still a Trap Card.) You cannot Normal or Special Summon other monsters the turn you activate this card. Once per turn, during your Main Phase: You can Tribute 1 Machine monster; this card gains ATK equal to the ATK the Tributed monster had on the field, until the end of this turn.