Wow...
Surely the 2019-20 SP Authentic Upper Deck Update cards must include a Young Gun of his???
They burned his rookie year off in 18-19 by including him in the e-Pack exclusive Compendium set. He was not included in any other sets. I don't think UD usually does rookie cards for a player two years in a row.
He has 1 physical rookie card that has 3 total physical variations. That is the Compendium rookie card in blue, gold, or as a 1/1 printing plate.
While Upper Deck probably has a bunch of his blue rookie cards sitting in a warehouse for ePack, in actuality the amount available are extremely low because the only way to get a blue rookie card is for someone on ePack to create one by combining 10 digital versions of his Compendium card. To do that, someone either has to buy cases of Compendium, or spend enough time trading on ePack to get 10 of the digital cards.
Now that Hogberg has broken out, the supply has mostly dried up. The series of Compendium he is from is not out of stock on ePack, and they periodically put "boxes" of Compendium on sale for 5 dollars. So it is likely that the supply will go up sporadically, but the fact that people have to take the time to trade on ePack to make physical versions of his card creates a huge bottleneck.
The print run of his blue card is probably under 100 right now. There are 77 historical sales of his blue Compendium card on COMC, which is the site people use to transfer their ePack stuff and sell it on. But it has to be accounted for that a lot of cards on COMC sell multiple times before being taken off the site because the site has flippers who buy and re-price cards. So it is unlikely that there have been 77 individual versions of his card sold on COMC. There are only about 23 possible copies of the card sitting in accounts on Upper Deck ePack.
100 of an individual card is not very limited in today's day and age where there aren't a lot of buyers for sports cards. But it has to be considered that rookie cards are pretty strong in the hockey hobby, and we're not just talking about 100 of a specific parallel, we're talking about a player who might only have around 100 rookie cards available total. Speaking in relative terms, Young Guns rookie cards are printed into the five figures, combine that with O-Pee-Chee, MVP, etc, etc, etc. If Hogberg becomes a star, and there isn't anything sketchy like a pallet of his cards going out the backdoor of the Upper Deck factory and landing on eBay, his Compendium card might be worth a lot more than a comparable goalies rookie card simply because of how limited the supply of total Hogberg rookie cards are. That is even considering that Compendium is not a strong or known brand name at all.
The gold parallel is nearly impossible to get. I think it requires combining 20 blue parallels, or 200 digital versions.