brothers war booster box MtG: Jumpstart pack are fighting over the Powerstones they each have a part of The Brothers War - Jumpstart

Even without real demand, market prices can be set that way

Unless the original itself has an anti-counterfeiting device, the item has been appraised by Wizard of the Coast to determine whether it is authentic or counterfeit, or has been exhibited at an authorized auction and has an appraisal certificate (the problem is that even the appraisal certificate can be forged)

Its explained just before the 1 minute mark

Lower Text [Security] You may play 1 [Hawkmon] or [Salamon] from your hand or trash without paying the cost

Special Summon 1 "Neo-Spacian" monster from your hand to the same side of the field as the selected monster

It can be said that it is an excellent card for both combat and deployment