Even though you wont find Liliana in any non-Zombie deck, I still could see it having an impact on Standard in the next couple of months before rotation, as many of the same Zombie cards that were in Gerry Thompsons Pro Tour Amonkhet- winning deck are still legal in the format right now
Kess, Dissident Mage Graveyard recursion for non-permanent spells is always a great thing to have, especially in a format like Commander where you can only have a single copy of each non-basic land in your deck
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An inverted version of this would be Fist of Suns and Jodha, Archmage Eternal, both allow you to pay WUBRG instead of a card's regular mana cost
If you can ever get two of them and one gets the other back, thats practically a win condition all on its own