Machine King - 3000 B.C. (GLD5-EN051) [Gold Series: Haunted Mine]

After activation, Special Summon this card; it is treated as an Effect Monster Card (Machine-Type/EARTH/Level 4/ATK 1000/DEF 1000). You cannot Normal or Special Summon another monster the turn you activate this card. Once per turn, you can Tribute 1 Machine-Type monster to have this card gain ATK equal to the Tributed monster's ATK, until the End Phase. (This card is still treated as a Trap Card.)