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That doesn't mean you shouldn't play it, as it's very strong and can definitely win you games or at the very least, make it so your opponents are unable to maintain a boardstate

Special Summon it to your zone this card points to, but each turn, it cannot attack unless this card has already declared an attack that turn

Card Holder : Compartment for holding the user's Main Deck

That makes them hard to come by unless youre willing to spend a lot of money

And then, finally, it acts as a Contagion Clasp with the hot 4 mana and tapping to proliferate

Since the permanent is a creature and not a planeswalker, it can't be chosen as a target when your opponent declares attackers, and it won't leave the battlefield if it runs out of loyalty counters