Specifically if you can meet them and see the cards in person and they allow you to verify its authenticity or provide you with authenticity verification paperwork
In the end this is up to you to decide, personally, I do not recommend it because of the risks
Some cards, such as MetalGreymon and WarGreymon, are relatively common
In todays market, finding a good deal means identifying cards that feature legendary illustrators or meta-defining abilities that are currently undervalued relative to their rarity
On top of this, relying on TCGplayers market price during the presale period can be rather unreliable
Its a six-cost green Character with Double Attack and an On Play that, for multicolor Leaders, sets up to four DON