Pro player Sam Black has gone on record stating that he believes 2-3 CMC mana rocks that tap for 1 mana typically hurt EDH decks more than they help them, and that early turns are usually better spent on other value pieces that more directly contribute to their game plan
You're going to attack battles that you control, the first time you've been able to attack your own permanents
Similarly, if a creature you control with lifelink deals damage to another player, that player will lose life but you won't gain any life
Side pockets stop cards from sliding out the top during transport, while a full-perimeter zipper blocks dust and environmental exposure
After the initial release of Pokmon Card 151 [SV2a], the Pokmon TCG experienced an uptick in general popularity for this same reason
Since Amazon has some of the lowest prices you can find, they are still worth it, though, especially if you like to open up packs