S tier cards are either archetype defining or get banned, they dont come every set and that is okay
Since the graveyard is often like a second hand for many decks in Commander, denying your opponents access to it puts you at a distinct advantage
It's a wicked and very fun combo, which is why Timestream Navigator is suddenly in the limelight, and shooting up in price
This creature can quickly snatch up your opponents Commanders in a Landfall-focused strategy, but even in a big blue deck that just wants to cheat things into play, Roil Elemental can seriously impede your opponents progress
This card has some quite fun interactions of turning any old token into a dog or cat token
Dark Ritual and Cabal Ritual are fairly nice for a burst of extra mana for an explosive turn like a turn two K'rrik, Son of Yawgmoth