Felhide Spiritbinder costs 3R (3, Red) to cast. It's important to note that with just a single Ragemonger on board, he costs 3 colorless mana. (Ragemonger reduces the casting cost of any Minotaur spell you cast by RB). The Spiritmonger is a 3/4 Minotaur that’s likely going to be bigger than that upon dropping onto the field. It's likely that you'll have at least one Rageblood Shaman on board at that point, the Minotaur “lord.”
Already a decent Minotaur with good tribal synergy, the Spiritmonger also has an Inspired ability. It's one that should activate often in an aggressive Minotaur deck, considering that he can safely swing in combat much of the time. Whenever Spiritbinder becomes untapped, you may pay 1R. If you do, you put a token onto the battlefield that’s a COPY of another target creature (and it doesn’t even have to be your own creature). You make it an enchantment in addition to its other types. It gains haste, as well, and is exiled and the beginning of the next end step.
So what if enchantment removal can hit this token copy? It’s only going to last a turn, anyway. Being able to copy a Rageblood Shaman or a Ragemonger for 1R is perfectly useful. But, heck, it can copy ANYTHING! To be honest, though, did Felhide Spiritbinder actually see play?
Sadly, while Minotaurs were actually a very fun and reasonably competitive deck in casual tournaments, Felhide Spiritbinder wasn't ever really a part of those decks. Fortunately for the Spiritbinder, though, Neheb the Worthy came along to be a solid Minotaur Tribal commander. So, he does see some play. Some other Commanders such as Mogis, God of Slaughter will conscript him on occasion, as well.
Felhide Spiritbinder probably should have seen more Standard play than he did, honestly, although he just couldn't find the deck slots. But if you're putting together a Minotaur deck, he's worth a look.