We had done some (decidedly unscientific) testing with it, which we even made mention of in the June 2012 announcement
Entering the battlefield tapped, this card is already at a disadvantage, which is made worse by its meager stats
The fact that these cards let you sacrifice any Desert and not just themselves means that each extra Desert you have in play could be worth two to three extra points of damage
All of these are very much versions you can find easily, and for very cheap if your deck wants a Phyrexian Arena
//// Ragnarok, Divine Deliverance Legendary Creature Beast Avatar 7/6 Vigilance, menace, trample, reach, haste When Ragnarok dies, destroy target permanent and return target nonlegendary permanent card from your graveyard to the battlefield