It has the cheapest Impending cost as well, but it also enters the battlefield the slowest with five time counters
The card sees plenty of play in Cube, Commander, and even Pauper, and I think this value will hold or even go higher based on players' demand
Mayaels Aria is also worth bringing up since its the most accessible price-wise in a decade after its Surviving to Upkeep One thing you'll notice that all these cards have in common is they trigger at the beginning of your upkeep, which poses the inherent problem of projecting your win condition to the field potentially multiple turns before you can pull it off
Merchant of the Vale Personally, Im not the biggest fan of this card
This planeswalkers -2 ability gives you the best creature on the board, and you can do it again next turn, should the dragon stick around
A fully stacked Ring-bearer can be hard for your opponents to deal with, so this could be an interesting build