You get an extra vamp token for every vampire you cast (even while it's in the command zone), consistent and recurring +1/+1 counters for all your bloodsucking minions, and the card itself has first strike and haste
Because this bounces back to hand to do the thing, you cant build an engine around sacrificing one Minister of Inquiries to get back another, netting energy
This slow burn might not seem too impressive on the surface, but its easy to break this effect and create deadly one-hit kills
Charizard ex uses Terapgos ex and Area Zero Underdepths to work with a bigger bench and set up the Noctowl engine to search for the cards it needs while also working around Budew Item Lock
It could be that scannable codes in packs (like in Pokmon) are added so players are incentivized to buy the actual cards, but right now thats pure speculation
Thanks to the recent price increase, Halvar, God of Battle (showcase) is currently the second most-valuable card from Kaldheim behind Vorinclex, Monstrous Raider (showcase) topping popular cards like Goldspan Dragon, Valki, God of Lies, and Koma, Cosmos Serpent (showcase), so I wouldn't expect to see it go much higher