To inject variety and test pure fundamental skill, developers frequently feature 'Draft' modes in special events and tournaments.

You cannot rely on overleveled cards or muscle memory from playing the same deck for two years.
Prioritizing Your Choices
The absolute most critical rule of drafting is ensuring you select at least one reliable 'Win Condition' (a card that targets buildings).

Always ask yourself: "If I give this card to my opponent, do I have a counter for it in the cards I have already drafted?"
If you give them a Balloon, you MUST draft anti-air immediately.Stability is key.Guaranteed damage is invaluable. The Art of the Bad Gift
Try to identify what kind of deck they are accidentally building, and feed them cards that completely ruin that synergy.

Their average elixir cost will skyrocket, their hand will be completely clogged, and they will be unable to defend your cheap, fast attacks.
Bad DraftingThe ConsequenceDrafting purely for synergy while ignoring the opponent's cardsYou might build a great Golem deck, but you accidentally gave them an Inferno Tower and a P.E.K. When you loved this information and you wish to receive more information about tower rush please visit the web-page. K.A, rendering your Golem uselessForgetting to draft any spellsYou will have absolutely no way to finish off a tower with 100 hitpoints remaining in overtime Playing the Hand You're Dealt
Even if you draft perfectly, you will sometimes end up with an incredibly weird, clunky deck due to bad RNG.

Master the draft, and you prove that your skills are universal, not just tied to one specific meta deck.