If youre sacrificing creatures a lot, it can wrack up counters very quickly
Progenitus Progenitus is a great creature, maybe one of the best on its own, but it's just too hard to cast
If the card is banned then it cant be used so there is less demand and there isnt much use in paying for it
Youre looking to combine goblin payoffs with cheap disposable artifacts here, so include all the usual goblin lords and cards like Skullclamp, Prized Statue, and Ichor Wellspring
Use a Mitsurugi Ritual Monster you Summoned earlier plus another monster to Link Summon Dyna Mondo whose effect you can use on your opponents turn to Special Summon that Ritual Monster from the Graveyard
There is, of course, the chance that the packs could contain a valuable card, but its not high, and no better than just buying the packs themselves for their actual price