I'll give you some tips on how I build my decks, but keep in mind that these are heavily skewed for Commander so they may not always apply depending on the format you're playing
As I look back through my archive of written material, one of the takeaways is that Commander 2017 was a very good set for sparking ideas for decks, to the point where there are generals I meant to dive into at some point that just got lost in the shuffle of everything else that goes on
Misty, a simple Trainer card, is surprisingly powerful and, with a bit of luck, can shift the game in your favor
The demand profile is fundamentally different
If a spell or ability you control causes all the targets of a spell to become illegal, that spell doesn't resolve but it's not countered
Its an excellent tool for both new players trying to understand the game and veteran collectors who want to scope out a new set before buying physical packs