Dice make much better damage counters than the discs of card, and again, in live competition theyre used anyway: 1 = 10 damage, 6 = 60
They dont like to see all their favorite cards sent away never to be used, and they find the play patterns of mill decks unfun for their Commander tables
Blink effects like Teleportation Circle and Conjurer's Closet set up a chain of value your opponents will struggle to overcome, especially with a sacrifice outlet to recur artifacts like Portal to Phyrexia and The Mightstone and Weakstone over and over
-9: You get an emblem with Whenever you cast a spell, target opponent puts the top five cards of his or her library into his or her graveyard
For example, here are some Commander Classic prices: Farseek - 1.99 - heavily printed and common Rhystic Study - 37.99 - common in initial set, heavily printed Dockside Extortionist - 64.99 - Rare in a few sets Sun Titan - 0.75 - Heavily printed as mythic and rare See how a rare Commander Classic Sun Titan is massively cheaper than Farseek which is a common
So if you have five Vampires, each opponent will lose five life and you'll gain a total of 15