Leyline and Waste Not work together, but Liliana's ultimate needs strong creatures in the graveyard, not the exile.
Permalink
Generally, this deck seems to tackle the idea of discarding the opponents hand and punishing them for that pretty well. But I do not quite understand why you want to exile the enemy's graveyards when you interact with them.Also, Liliana's Caress and Geth's Grimoire might be some nice cards to consider.