Some are just a function of relatively small supply and just a little demand will get there
Most often, the value of any card is determined by the gaming community or collectors
Its ETB effect means it wont make the best commander (unless you invest heavily in ways to bounce it in mono-red), but nothing beats hitting Muxus for free thanks to Warren Instigator and Goblin Lackey
Unfortunately, the reality was much less peaceful
The combination of Tuskers value in specific decks as well as the general usefulness and card advantage of the cycling ability to obtain cards cheaply, combined with the versatility of the card to swing and block in the red zone, creates a card so powerful that it almost made the top spot on todays list, and at one point in time, it was there
Lately, it would have to be Thopter FoundryThopter Foundry for me, because of the combination it has with Sword of the MeekSword of the Meek