It could be flipping a battle, cascading, a suspended spell going off, or anything with retrace or rebound
What really stands out is the new Commander precon deck
Witch's Oven Cauldron Familiars partner in crime, Witch's Oven and the cat create a combo where you sacrifice the Familiar every turn to make a Food, which then returns the cat to the battlefield, draining for 1
Flip through your cards and put the uncommons, rares, and mythic rares into separate piles
This effect is fantastic nowadays because tons of decks actually rely on the graveyard with Dragons Rage Channelers, Murktide Regents, Snapcaster Mages, Wrenn and Six and even reanimation strategies through Unburial Rite or Living End
Your opponent gets to do nothing, while you might still get to do something