Not to worry though, Manufactor is one of the most popular EDH cards from the set, just missing out on a top 10 spot at number 11 on EDHREC (going by raw number inclusion rather than percentage)
It is a potent card if you have Omniscience in play for that purpose alone, and even if you are not playing combo dragons you will often be able to construct a combination that wins the game if you have a Omniscience in play or just a million treasure
Counterfeit foils are a little harder to spot since the foil layer means they cant pass the light test. One of the best ways to tell is to use a loupe, a small magnifying glass typically used by jewelers
In addition, some cards may give you mana for the short time of one use
Foundations (FDN) #205 Illustrated by Jason A
That way, youre not just gassing up a player with an already-broken deck