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Both have a lot of mythics that were hyped for casual and Commander play but not obviously great for Standard (these are the Gods for Hour of Devastation and the Dragonlords for Dragons of Tarkir ), both are sets without a rare land cycle, and both are the final sets in their respective blocks
The thing that pushes this to a level above cards like Impulse for me is that you can put things back into your deck and that is something not many cards in magic allow for, certainly not in such a cheap and painless way as this (except of course Brainstorm...)
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For players, it offers three ready-to-play decks in one box, making it easy to learn the game, teach friends, and enjoy different deck styles
If you play a deck with these cards correctly, you can chain together a ridiculous amount of effects to make your enemy have a terrible time