While you have little control over what card you have on top of your deck, there are a few cards that let you manipulate the top few cards of your deck to make it more advantageous for you
As a result, we want a few more copies of Kataras effect, which also happens to stack
Perplex Perplex gets less valuable as a counter the more graveyard decks proliferate in EDH, but having a weak counter you can convert into a Teferi, Time Raveler, a Toxic Deluge, or so many other powerful things when it needs repurposing is great
The designers had a new benchmark to work from and let loose a little more
Lorehold: Flashback Excavation Lorehold quite literally digs into the past, bringing back the returning keyword Flashback on instants and sorceries
In exchange for this higher price, you receive colored mana instead of colorless, which arguably makes Sacrifice much more helpful for powering out huge spells and powerful threats