My vote is for the Common Fire Cards. They will win because in my head, this is how the fight will go down:

1. The Goblin Shaman looks like he's capable of voodoo and other mystical powers. That should include animating corpses, so he can take over the Animated Corpse and get him to attack one of his own, specifically the Skeleton Assassin. By the end of the turn, one of them will be dead and the other will be severely injured. Either way, both will be unable to fight.

2. Next, the Fire Beetle looks like it actually spews fire, so he can attack by burning the remaining Death lineup. Because the Animated Corpse and Skeleton Assassin are either dead or too injured to fight, the Beetle won't attack them, so there is no danger of a burning corpse or skeleton that could retaliate against the Fire Team. At least one of them should be eliminated from the attack.

3. Then the Giant Roc and Kobold Miner can double team whoever is left of the Death Team. Between the Spineback Wolf and the Haunted Spider, I think its the Wolf who is more likely to survive the fire, so the Kobold Miner will launch a frontal attack on the Wolf, hitting it with his pickaxe. Since he looks like he has tough skin, the Miner should be able to withstand the Wolf's claws and survive enough to beat the Wolf into a pulp.

4. Meanwhile, the Giant Roc lays in wait, as backup, ala the Giant Eagles in LOTR. Then, in case the Skeleton is still alive and regains his strength, the Roc will swoop in and attack.

Obviously, if I win, I will want to Fire Cards.