Yeah, drawing seven cards for free (once you hit six mana) seems like a bargain to me as well
There aren't too many ways to reprepare a creature, but flicker is one of the easiest, most consistent ways to do so when the creature enters prepared
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
Akin to colorless card draw, you may find our write up on colorless tutor cards helpful as well
Plus, if someone gains control of one of your best Slivers, you can utilize Sliver Overlord to get it back