Combine this with the fact Frodo can be out as early as turn two with the right mana and you've got a hobbit that will keep your hand full and the Ring whispering in your ear
We also have the classes themselves shown off in the entirety of the set thanks to the number of Black Mages, Warriors, Red Mages, etc in the entirety of the series
Stuff like Snuff Out or Dismember are already heavily played cards, but here, you get to draw a card from them because you lost 4 life, and you also get to drain your opponents for 2 life, offsetting your life loss
In many ways, Doughnut is the logical conclusion in the Wizards quest for an integrated finale to the Magic year, and crucially its a set that you have to buy. In terms of Standard, Doughnuts 50-60 rares may not make a startling impact, but you have to remember that it services not one but two Block Constructed formats
The issue is that most cards tend to go up in price as time passes