Jace is good stall and he is good card draw and he manages to be either or both as required in a lot of situations
No matter which of these routes to victory you aim for, timing and patience are critical for winning with a flicker deck
Delve is just going to turn on in these formats because we will fill our graveyard up quite easily with Verdant Catacombs, Lightning Bolt, Thoughtseize, Serum Visions, and the like
If you don't want to play a linear combo deck, however, Vito can still lead a strong lifegain deck, where you can stack similar effects like Enduring Tenacity, Starscape Cleric, and Sanguine Bond to gradually burn out your opponents
Endrek Sahr is an incredibly powerful card, and in the right hands it can be the cornerstone of an entire strategy