Edison Format · March 2010
'Ancient Gear' cards means any card you control that has 'Ancient Gear' in its card name.
You cannot activate "Spell Gear" if you do not have any "Ancient Gear Golem" remaining in your Deck.
If an effect is chained that prevents you from Special Summoning "Ancient Gear Golem", you still cannot Normal Summon or Set until the end of your next turn.
The effect that prohibits Normal Summons or Sets until the end of your next turn is not a restriction on this card's activation. So you can activate this card if you Normal Summoned earlier in the turn. But you cannot Normal Summon or Set after it is activated.