Pack Rat costs too much mana to do much of much, Dark Confidant and Co are all a little dangerous to throw in any old list, most of the rest are BB to play which leaves Heir and Carrier Thrall as the best on offer
It also gets Rampage, which allows it to become stronger if it's blocked by more than one creature
If tails, the attack does nothing and put three damage counters (30 damage) on the Confused Pokmon
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Scarcity plays a big role: As a special set, its print run is finite, leading to shortages amid Kanto hype from games like Legends: Z-A
However, its not a deck that benefits all that much from being played like a Voltron deck thats to say, you probably want to spread your equipment across your board to get the most benefit