With decent stats, shes key to slowing down your opponent, and can be a good target for Ready effects
Howling Mine (T1, Ext, S) If any one card in Magic is the poster-child for card drawing, it is Howling Mine
This means that once you trigger it for the first time, you're already ahead rather than breaking even, and it also means that it's extremely hard to trade with on a one for one basis
And, of course, players will find an abundance of both dungeons and dragons
In other words, a common appearing five times on the common printing sheet has 5x the total number of copies in circulation as a common appearing just once on the printing sheet, and was 5 times more likely to show up in your booster pack