If this card was Tribute Summoned by Tributing an "Ancient Gear" monster, if it attacks a Defense Position monster, inflict piercing battle damage to your opponent. If this card was Tribute Summoned by Tributing a "Gadget" monster, it can make a second attack during each Battle Phase. If this card attacks, until the end of the Damage Step, your opponent cannot activate Spell/Trap Cards, also monsters in your opponent's possession cannot activate their effects. At the end of the Damage Step, if this card attacked: You can destroy 1 Spell/Trap Card on the field.
Your opponent cannot activate anything while this card is attacking.
Destroys a Spell/Trap card on the field.
Could be costly to summon.
Has no effect protection outside of battle.
Some effects are dependent on monsters you tributed to summon him.
Pay 2000 LP with Mausoleum of the Emperor to summon Ancient Gear Reactor Dragon. You can use Ancient Gear Castle with 2 or more counters as the tribute to summon Ancient Gear Reactor Dragon. Cost Down and Amarylease can be used together or individually to ease the summoning of Ancient Gear Reactor Dragon.
Keep in that the first two effects of Ancient Gear Reactor Dragon are dependent on the monsters you use to tribute summon him. Some of these methods may let you summon Ancient Gear Reactor Dragon without using any tribute fodder.
When Ancient Gear Reactor Dragon attacks you can destroy your own Geartown to Special summon another Ancient Gear monster from your deck for an extra attack. Geartown will also help you ease the summoning of Ancient Gear Reactor Dragon.
Well, considering you cant obtain it by any other than buying, it is obivious.
Does dimensional prison work on this card? It just says "when it attacks", not if a attack is declared. So when they say "I attack!" with reactor dragon, can you still use dimensional prison to banish it?
Slugger only if midfielder is on field as well. He will need more than one turn to reach more than 2800 ATK points which in the OTK meta is crucial. But yeah, it can PENALTY box the reactor dragon lol.
Good deck, extremely vulnerable to a strong back row.