To buy from them, you will almost always need a proxy or forwarding service (Source: Furthermore, for extremely high-demand items, they often use a lottery (chusen) system where you have to enter for a chance to even buy the product
I expect to see this in a lot of merfolk and wizard decks going forward
You can do this over and over again, so over several turns, the free cards should prove to be pretty game-changing
Merfolk have come a long way since that card released, but Seahunter from Nemesis can nab you any Merfolk youd like from your deck for the low, low price of tapping it and paying
Any last-minute adjustments will be made to ensure the tattoo perfectly matches your vision
If you have a lot of decks like that in your local playgroup, you can take advantage of the End the Turn part of Ultima to stop things happening after it resolves