Ancient Gear Box (SR03-EN011) - Structure Deck: Machine Reactor Unlimited

If this card is added from the Deck or Graveyard to your hand, except by drawing it: You can add 1 EARTH Machine-Type monster with 500 ATK and/or DEF from your Deck to your hand, except "Ancient Gear Box". You can only use this effect of "Ancient Gear Box" once per turn.