When this card is Normal Summoned: You can add 1 "Machina" monster from your Deck to your hand, except "Machina Gearframe". Once per turn, you can either: Target 1 Machine-Type monster you control; equip this card to that target, OR: Unequip this card and Special Summon it in face-up Attack Position. (A monster can only be equipped with 1 Union monster at a time. If the equipped monster would be destroyed, destroy this card instead.)
Equipping himself to another monster reduces your field presence.
You can search out Machina Fortress and Special Summon it with its own effect, then attack Machina Gearframe to Machina Fortress. Machina Megaform can be searched to be used as the cost for Machina Fortress’ summoning. Machina Megaform will then be set up in case Machina Fortress is sent to the graveyard.