Sure, you only get to venture into the dungeon when you untap the artifact and let its victim go, but still
Narset, Parter of Veils and Ashiok, Dream Render are new planeswalkers that are nice at shutting down some of the more egregious things your opponents can do in Commander
Conversely, Pact of Negation, which is convenient when pushing through your own win condition to end the game on the spot, could be said to have strong aggressive elements, as its drawbacks become prominent when used to handle an opponent's actions
Motif: Agenda: Mirran survivors have found refuge in the Furnace Layer, and Urabrask has commanded his furnace legions to turn a blind eye to the refugees
If, however, you value long-term setup, politicking across the table, and making your opponents suffer for daring to hit you, then you're in the right place
That high level of flexibility is crucial in tempo decks that walk the line between aggro and control