When going to MTG Grand Prixs or Magic Cons (large events with lots of vendors) I always just assumed you paid the sticker price that vendor was asking and that's that
However, Hirams power lies in the cards abilities
Either way, Id estimate roughly 75-400 of them were given, although only a handful have emerged and a lot of people from Germany arent even aware of its existence
You can use it to maximize ETB effects or remove pesky blockers, create strong tokens, or remove wide board threats
If you want to cycle through your deck to find your best cards, the way to do that isn't to play extra cards
Don't be afraid to lose your creatures in combat, especially if you take out an opposing creature, you're just going to get them back anyway