They carry a star rarity symbol and represent some of the more desirable pulls in any given set
Historically, white has struggled with ramp and card draw when it comes to EDH
The Prismatic Piper also returns in Commander Masters as a bonus card, in case you don't find a legendary creature to helm your draft deck
For example, if Woodcutters Grit gave Identity Thief +3/+3 and hexproof earlier in the turn, Identity Thief will still have those bonuses after copying a creature
Then theres Take Up the Shield, giving a creature a +1/+1 counter, lifelink, and indestructible for a turn, saving your creature from certain doom
It encourages everything I want from Commander and will be a deck I build shortly after release