You can bloodrush your opponents attacking creatures too, and it can be an interesting play to mess with combat in EDH when only your opponents are involved
Black has dozens of this style of card, but aside from the proactive Kayas Ghostform, no others actually help with your creature getting exiled, which it usually is if its being targeted
Kaya protects any big CMC investment but she also comes down and has a -3 ability that will answer any nonland permanent, which is extremely helpful when there are enchantments and artifacts running wild in Commander
Overall, while players seem pleased with the card choices based purely on flavor, the general consensus is that the product needs better card selection
But we all know thats not what makes this card great
Get too many Set Boosters and not enough Draft Boosters, and you can't run Limited events, which costs the store money