Dragon Broodmother: For two less mana than Verdant Force, you get a card that makes flying tokens. This card gets out of hand really quickly. However, unlike Verdant Force, the tokens can get really really freaking large. It's not the amount of the tokens that becomes outrageous but also their size! I love how this card shows the ruthlessness and survival of the fittest of Jund. The babies in the nest eat each other to survive.
Jenara, Asura of War: A three mana 3/3 flier that gets larger and larger and larger. This card comes down early and is a huge beating. This card is a threat all on its own. This card really isn't amazingly flavorful or splashy, but she is freaking efficient. If I were on Bant, I'd be grateful I was following her.
Karrthus, Tyrant of Jund: Okay, now we have a dragon lord. I love this guy so much. He's so powerful that all dragons immediately flock to his side and attack at will. His threat is immediate and permanent. I keep on thinking that eventually they're going to have to run out of ways to create unique dragons; this one is just so different from the rest. It's very nice.
Lord of Extinction: This card is a beating. I also love how he does not have trample. I love that so much. He wants to devour everyone of your opponents creatures before it devours your opponent. He's hungry. I also can't believe that they never printed this before. It seems so obvious.
Maelstrom Nexus: Cascade is fun. This card gives everything you play cascade. It's fun. It's random. It's worth the effort. It's chaotic. It's a new effect. It's never been done before. It's mythic.
Sen Triplets: I like how this card has a very "Mind Slaver" feeling but is so different from that card. It doesn't have the feeling of hopelessness as much as a feeling of, "Oh my God. I need to play my spells before my plays them for himself!" Instead of using your opponents cards "badly" you are using them to benefit yourself. It's an interesting take on using your opponents' cards against them, and I like it.
Sphinx of the Steel Wind: It's an Akroma, Angel of Wrath variant. I remember so many people complaining because this is such lazy design. I would like to tell those people, "No, you're wrong." I mean, while it looks like they just throw keywords on there, they don't. There could be a different Akroma variant in every set, and every little different keyword or power or toughness completely alters how the card works. Anyway, this card is house.
Thraximundar: This card is an joy on a creature. He comes out of nowhere and BAMS! Your opponent is down a creature, and you have a 7/7 guy heading his way. He's a beating that gets larger and larger as the game goes on. Again, I could easily see this guy having trample, but I love that he doesn't. He wants to kill everything before he kills your opponent. I guess zombie assassins do have all the time in the world to do their job.
Uril, the Miststalker: This is the creature that keeps on growing. "Troll-shroud" is such a powerful ability that really combos well with Aura because it makes their built in "card disadvantage" much harder for you opponent to exploit. Uril even gets bonuses for those auras!