It's also showing off the Ghostbusters' quote "Dogs and cats, living together, mass hysteria." I also enjoy just how flavorful the card is
Lord of the Nazgl Lord of the Nazgl can quickly create lots of Wraith creature tokens for you
Similar to single card prices, the price tag on booster packs varies greatly
Perhaps the best thing you can do with all that mana, besides dumping it into a massive Finale of Devastation, is to put all that mana into a Helix Pinnacle, which once you put 100 mana into it, you just win the game
You can sacrifice a high-power creature, generate a massive burst of mana, and then dump it into his second ability, paying six generic mana to play the top card of your opponents libraries for free
It spreads -1/-1 counters on entry, then converts opposing losses into stolen threats