What makes Retrofitter Foundry great is what you can do once you feed it a ton of mana
If you're playing Hearthstone and know that the new meta is dominated by gurgling Murlocs, you'd normally have no option but to buy a dozen random packs and hope you draw what you need, putting a quite a lot of money into ActiBlizz's pocket along the way (and even then you're not guaranteed that you'll get the cards you want, potentially prompting further purchases)
Though thats a consistent theme, we have plenty of options that care about the graveyard or are simply zombies for flavor purposes, like the God-Eternals Nicol Bolas used to invade Ravnica
1 Ezuri's Predation A stellar green sorcery for eight mana, Ezuri's Predation can immediately swing a game into your favor in the late game, wiping your opponent's board while providing you with an entire board state of tokens
The PSA grading cost Pokmon collectors pay is an investment in authentication, protection, and potential value increase