While there is something to be said for having to commit to certain types, its a bit unfortunate that its taken to the degree where dual-type decks can feel awkward and triple-type decks, while allowed, require very specific cards or a lot of luck to pull off
The DCI, as google tells me, is the governing body behind things like banned cards, restricted cards and the way that the competitive gameplay is governed, and the artwork (done by Maro?) is just a scribbled dude in a blindfold holding a mug of beer tossing darts at cards on a dartboard as a self-deprecating way to show off the "rigorous decision-making process" that the DCI uses to ban a card
The game is too prone for donking (winning the game in turn 1 or 2 by knocking out all your opponents Pokmon before they manage to set up) that it feels it would create a very volatile format with luck playing even bigger role
Enclosed footwear is a mandatory requirement for all Grays vendor sites
But spending time and money on mana stuff lets you ensure that you can do things like cast fat spells and dorks and break people's faces and draw cards and ramp and counter and loads more