How does this happen? Whenever you see a price difference this staggering, you have to take notice. Lots of decks are being built from the cards from these decks and not everyone chooses to play the Beacon for whatever reason. It's because the people that are getting this card already have the copies they need. Because it has different art, it's a unique version. It seems players really prefer the original art, as people aren't buying this up very quickly. So currently, these cards are available at a near 75 percent discount!
This is probably one of the best cards that's available for $1 as of mid December 2016. It likely won't stay this cheap. The other versions will probably drop in price, but they shouldn't stay this cheap considering how popular this card is in Commander.