The first tier (Essential) gets you everything below including the Iago promo
My slightly modified list is probably worse than the original, but were showing off warp this way
Alara Reborn pushes multicolor gameplay to its limits, offering powerful gold cards and creative synergies across all five colors
It started with Bloomburrow and Duskmourn and has led me to the new Final Fantasy precons

If you arent sure of where to begin, here are a few other example Commander Deck strategies to help you get started: My commander has an awesome ability that Id like to build around and support I want to play big creatures and spells with cool abilities then run over my opponents with raw power If my opponents dont have mana, anything I do is the most powerful thing at the table Im trying to assemble certain pairs or trios of cards that form an infinite loop that will win me the game Im trying to reduce all opposing libraries to zero cards I want to dictate which cards my opponents are allowed to cast so I can curate the most powerful board position My commander should be able to attack someone for 21 points of damage and take them out of the game Lets fill the board with as many tokens as possible and turn the swarm loose on my enemies There are a lot of cool creatures in x creature type lets build a tribal strategy and see where it takes us Planeswalkers are cool I bet I can build a deck around those People should attack each other more Ill make myself an unappealing and/or unavailable target so they do that Lets give everyone extra resources, but ultimately Im the one who should benefit most from them I could go on, but you get the idea here

Neither of the abilities are specific to this deck and strategy, and while that makes it weaker here it might still be strong in other decks