As many one mana elves that produce mana as possible, then as many two mana elves that tap for a bunch of mana as there are, enough card draw to keep up with your mana production and then a way of winning, usually Overrun effects and of course Gaea's Cradle and now Nykthos too
As Magic: The Gathering has evolved over the years, Commander has gone from a fun social side format to the most popular way to play the game overall
Therefore casting Echo Storm after casting your commander a single time becomes worthwhile, and I'm confident in saying that getting anything more than two copies makes this card bananas
Its finding one that reliably passes the shuffle test : consistent thickness, clean cuts, readable text, and a finish that doesnt feel like your deck is half playing cards and half cereal boxes
Brick and mortar stores have turned away from the practice of pushing repacks and the business has moved online