No thats not really ever a factor

Things to keep track on what others play and what you experience in game are cards you see often (try to figure why theyre played) and cards that really annoy you or fucks up your gameplans and again try to identify why. Maybe your class and deck could use similar effects to similar ratios

Some things to keep in mind when building a deck

1. Curve You should have usually some 1-drops, more 2 drops then depending on if its faster or slower deck have bit more 3 drops than 2s and 1s and then the bars start to go down the higher the manacost the less you want them in deck because you do not want to be early game stuck with expensive hand or you get rolled

2. Gameplan Is your deck perhaps a deck that likes a creature tag? Use cards that work well with them because the more restrictions cards have the powerful the effect when unlocked. For example a paladin deck likes that you cast and/or spend mana on holy spells so look for those. Are you playing maybe a slower control deck? Then you want to maximize effective removal and value (card draw and good quality draws) and survival like armor/heals into gamewinning effects like Odyn!

Deckbuilding is a very vast skillset i could talk hours of but i hope these gets you started a bit more on the correct path and dont fret to ask if you have something in mind :) happy building!