That concept is what has helped me get over the A15-20 hump. It's more important to draft cards that shore up immediate weaknesses than it is to draft cards that might pair well with other effects in your deck. Draft for the short-term, not the long term, because stronger short term victories means you can pathfind more aggressively and acquire more gold/rewards.

I'd say that's probably the most important "ah-ha" moment where my winrate really started to significantly improve. That and knowing when to min/max # of combats while pathfinding.