Originally Posted by
Nikkaszal
I'll fill you in on the number one secret of deck building:
Know your rank area's meta
A given deck needs to be adaptible, flexible, and tailored to provide the maximum chance of success vs the majoroty of decks that you yourself are facing. Are you up against a ton of shamen/warriors? Ooze or Harrison should be an auto-include in almost any deck you create. Then hypothetically, you rank up a couple and most of your opponents are druids/mages/warlocks - that Ooze which treated you so well is now going to be a dead card a lot of the time. Take it out and tech in something else.
You should be constantly tinkering with a deck. Don't try and force something to work if it's not going well. Example - I made a Yogg Rogue deck purely to try and find a use for Thistle Tea. I like the card, and I WANTED it to work, and I figured this would be the best deck type for it. However, after a couple games it quickly became apparent that it doesn't, so rather than shuffle stuff around in the deck to make TT a little better, I just cut my losses and tossed it.
The second most important part of deckbuilding is have a win condition. Using the above example of my Rogue'Saron - I packed a deck with spells, Pillager, Auctioneer and Drake and then tossed Yogg in. Then I remembered that Yogg is NOT a win condition; he's a second-chance turn around play. Can't rely on him to win games. So I threw in Maly, Sinister Strikes and Thaurissan and BAM - that's a win condition. That's something to work to that will win games for me as I control the board and hold Yogg for YOLO plays.
Deckbuilding does not mean you have to come up with a brand new idea never seen before in the game (eg you don't need to be the pioneer of the next Patron or Handlock, examples of very specific card interactions that ended up being wildly powerful). There's no shame in seeing what works with other decks and adapting a general idea into your own. The fun comes with fleshing out that idea with your own flavour.
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Oh, one last thing:
Don't try and counter every single deck you can
This is something I see a lot with my newer mates - they try their hand at deckbuilding, then they add some tech to counter aggro, some to counter fatigue, some to counter secrets etc etc.
Don't do this. Your deck should counter the most common threats you face, and outliers just need to be foregone. If you're building a hyper-aggressive Warrior, you don't want to include SB+SS x 2 just because it's so good at mid/late removal; all you're doing is wasting deck slots that could otherwise be filled with cards that get you closer to your win condition. So long as you maintain a positive win rate, that's all that matters. There is not a single deck that will counter everything, you need to be selective.