Super clear, regular 3" x 4" Toploader and Sleeve combo for standard size cards (2-1/2" x 3-1/2")
One of the first things I like to do when I get a new set, it to open a couple of booster boxes, make a set of all of the commons, uncommons, rares, etc, and then sit, look at them, and read the flavor text to feel the story and the world
It is most akin to countermagic in that it can deal with anything, it is one of the few things than can stop instants and sorceries from happening and it suffers the drawback of being time critical
You can sacrifice a high-power creature, generate a massive burst of mana, and then dump it into his second ability, paying six generic mana to play the top card of your opponents libraries for free
The Eldrazi probably speak for themselves