I vary quite a bit in my deck builds. Sometimes I see some sort of combo or synergy that fascinates me so I design a deck around that (like the
Ruthless Deathfang and Eldrazi Scions). Other times it's about a card I really like or see a lot of potential in (like the
Soul Swallower). My main Standard deck is an anomaly as it's literally just things I really like thrown together in a workable deck. It started with the
Acid-spewer Dragon, because I won with it in my first game of Magic ever, and the
Managorger Hydra and I wanted +1/+1 counters,
Lifelink, Deathtouch, morphs and dragons to factor prominently because I like all of those things. It also had to be Abzan colors because those are my favorite colors.. So, like I said, I vary.