For players new to the game (and even some of the old), there's this word flying around: 'meta' that doesn't seem to make any sense. Rather than sitting there nodding your head and pretending you understand what it means, here's some help.
The 'meta' refers to the current playing environment, particularly the types of decks being played, the cards that are being used most often, and what's popular in general. Understanding the meta allows a player to refine his or her deck to account for cards that are becoming strong (perhaps too strong).
For example, the prior post mentioned Madril and how powerful he can become given an Ithilien blade. If the meta of your local playing environment included many players with Madril decks, you could account for this by playing cards such as this:
By playing this wicked Nazgul card, you are countering the meta in several ways. First, you have given yourself a method by which you can remove the threats that are keeping your minions roaming. Second, you have a method by which you can play minions for cheap. This allows you to play more Nazgul, so even if your minions are still roaming, your opponent may not be able to discard all of them. Additionally, playing Nazgul in general is a good counter to this meta. Each one that survives should easily be winning skirmishes against a deck that is dependent on not fighitng.
So the next time you're playing at your local card store, ask yourself, 'What is the Meta?' and think about how you can beat it!