The premium for a gem copy over a raw near-mint one is large enough that an authenticated slab is worth the cost and the peace of mind
Pokmon Center Japan does not ship internationally
Supply, Demand, and Market Dynamics Beyond individual card rarity, the overall market structure shapes prices
(Transfer its materials to this card.) This card is unaffected by your opponent's activated effects while it has 5 or more materials
Hitting for an additional 30 damage allows Mega Lucario ex to scale its Mega Brave attack from 270 damage to 300 damage, and it looks like you can play multiple copies to increase your damage from +30 to +60, etc
Because these Cosmos Holo cards are test prints, they were likely not cut in a factory, but instead were later cut from an original sheet