Flashback Matters - Izzet is usually this archetype
It is not just her threat level that makes her so good but also her versatility
Besides, if we are specifically looking for land, each card we flip that isnt land is one turn closer we are to actually finding land (giving us a sort of scry 1)
Think Lazav, the Multifarious, Gisa and Geralf, and Taigam, Sidisis Hand
Modern Staples Following the collection of legendary Creatures suited for Commander, we have a handful of Constructed staples
For how much Garfield and Magics other core designers didnt yet understand about the future of the game, the reasoning for this was simple, and showed a tremendous amount of foresight: adding more and more cards to a single card pool would, in Garfields own words, collapse the game into complexity and would strongarm players into buying cards they might not want. Hmm