If a nontoken permanent that's a copy of Enduring Tenacity dies while it's a creature, it will return to the battlefield as an enchantment when its last ability resolves
In addition you earn the in game currency (gold) which can be used in various methods to get more booster packs to expand your collection
I dont think there are many cards that summarize the reaction of the people of Zendikar in the face of the Eldrazi as well as Soul's Attendant
The value of a pack in the future revolves around the Pokmon starring in it, its chase cards (highly desirable cards), and whether the set is going to be rare
The LEGEND mechanic was rarely used competitively, most Legendary Pokmon during the Diamond & Pearl era were laughable (unless, of course, they could Level Up), and Legendary Pokmon in the ex series days were hit or miss
Rather than hitting planeswalkers, it has an option to hit graveyards, which is better in Commander anyway