//// 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
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 that being said, in those games where I did get to untap with him with a Goblin Electromancer and maybe even a Guttersnipe or two in play, It was fun killing an opponent from 17 life with pings and other incidental damage and card draw
All of these are very much versions you can find easily, and for very cheap if your deck wants a Phyrexian Arena
The exception is Sleight of Hand to try to find Lotus Bloom on Turn 1 in Ad Nauseam, with the flip side being many decks having an important two-drop to find like Baral, Chief of Compliance