The discard requirement on cast makes it generally worse than Putrid Goblin in most decks that are all in on the Persist combo itself, I would agree. I might have been projecting my own list a bit too much here, apologies.Why the Masticore? It seems like a worse card than let's say Putrid Goblin, for this deck.
I support artifact / welder and reanimator pretty heavily, and Masticore works well in both. Even with the Discard requirement, it being colorless is helpful when Persist shells have to dip into 4 colors. It being an artifact creature is both a liability and a boon. A lot of cards can remove it, but it juices some classics like Arcbound Ravager and Krark-Clan Ironworks. In the case of Ironworks, it can 'combo' into a board wipe using its expensive Activated Ability (this isn't relevant for your list but it is too cute for me not to point out lol).
But buffing specific cards is a claim to fame that Putrid Goblin has as well, and looking a little bit harder at your list it might be more exciting on that front. Pashalik Mons becomes lethal as a typal-blood-artist with it, and while it can be a little pricey the sacrifice Ability would put in work here too. Goblin Trashmaster is a little wonky here, but from my understanding he can situationally sacrifice Putrid / Redcap infinite times if there is a single valid artifact to target?
They both have their pros and cons in your list, it is a hard call to make, I'd say just trust your gut.
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