You don't choose which type of permanent any other player has to sacrifice
Given how easy it is to create the Darkstar token and that it doesnt cost any additional mana, Rufus Shinra is a great card for giving you continual fodder for your sacrifice outlets, but also just for good board presence
In Garruk's Wake does this a little differently by destroying all creatures and planeswalkers that belong to your opponents, leaving your stuff alone
A 5-mana 5/5 with First Strike and protection from Multicolored that makes you discard every turn would probably be a 2.5 at best thats a huge downside, even on an efficient creature
Or it would do, except that fans in the r/CompetitiveEDH subreddit found a way around this drawback as soon as Noctis was revealed
Spanish gaming store Gremio de Dregones offering 2 million Euros for the card, which translates to about $2.1M