The cards produced were gold-bordered versions, and thus are NOT legal for use in DCI-sanctioned tournaments
Once its Prepared, then you can put something truly scary in the Graveyard to exile and make a copy of
Initially designed by prolific Japanese deck builder matsugan on Magic Online, the idea was that Zoo decks already take a lot of damage from their lands, as they were generally four colors and needed Shocklands to support Wild Nacatl
Like, I can see a card coming out of development thats a four-drop 3/3, gains four life when it comes into play, and when it dies you get a 3/3 beast
Its strength comes from copying spells without investing additional mana, which sets up big turns by dropping Ral before following it up with Dance with Calamity or something similar
But then you have to pick one to keep and send the rest to the graveyard