You can Tribute this card; Special Summon 1 "Machina" monster from your hand or Deck, except "Machina Megaform". If a "Machina Fortress" you control is sent to the Graveyard, while this card is in your Graveyard (except during the Damage Step): You can banish 1 "Machina Fortress" from your Graveyard; Special Summon this card. You can only use 1 "Machina Megaform" effect per turn, and only once that turn.