User blog comment:BlackMist4848/Guide to Deckbuilding 101!/@comment-25600444-20141230225854/@comment-24965906-20141231142820

Another tip is that when you lose a game, or won a difficult game, examine why you lost or why it was difficult. This is more effective if you notice a trend over multiple games, but experienced builders figure it out in 1-3 games.

For example: *Hits 0 life* "Argh! I lost. I just needed an extra Shield...I had all these cards and not one Zealin' one was a shield! " Then look at your deck, observe the number of shield, and see if there is a lack of shields. Then add them in.

Sometimes it can just be fate just hating you on that match, but this approach is useful and helped me step up my game and improve.