Our main graveyard synergy is the various Unearth creatures, and for the most part wed prefer to cast them normally when the chance arises so they can stick around for a bit
That said, a lot of planeswalkers get used in a lot decks that dont take full advantage of all of their abilities
If your entire team has lifelink and eventually gets in an additional hit with that lifelink, thats a huge leg up on the game provided its enough to you stay in it while giving up a four-drop, so if certain matchups are structured in the right way, it could work
Plus he has a solid body for 4 ink that will be a decent questing threat after you've already gotten value out of his Reindeer Games ability
Karns Sylex What is a sylex anyway
Above, you can see the showcase stained-glass treatment we have given to each of the 41 legendary creatures in Dominaria United (20 uncommon, 14 rare, and 7 mythic)