Vish Kal can turn into a machine gun when needed and alpha-strike when the time is right. With all those disposable creatures, I have a lot of sacrifice in my deck.
I love Teysa, Orzhov Scion and all the interactions she provides, and had to build a deck around her. My favorite sacrifice effect for creatures had to be narrowed down to my top 5: Tyler covered the bases on what sacrificing can do for a deck built around her: Those of Orzhov inclinations fondly recall what Teysa, Orzhov Scion can do. There are other ways to sacrifice for value, of course. Grave Pact not enough? Sigarda, Host of Herons got you down? If Insurrection doesn't get the job done you can be sure she's not going back! And if you can exploit the opponent's "leaves the battlefield" abilities at the same time, even better. Finally, one of the reasons I made the deck in the first place is that Lyzolda serves as a reliable removal engine when combined with Act of Treason effects.