It's shallow, but given how much hate infect has managed to acquire through no fault of its own it's probably for the best that there are so few cards. I would love to see more infect cards hanging around so it would actually be reasonable to play them, but since my infect decks have already been banned by my casual playgroup (despite netting 0 wins...yeah) it's unlikely printing more would have made more people like them.
And skittles can easily be put in a non-infect deck. He's a 5 cost 4/4 flier with wither and regenerate who only needs to hit your opponent 3 times to win you the game. His damage doesn't stack with your other creatures, but that's a pretty small price to pay for what he does (block Avacyn then regenerate :P)