Skullbriar is mostly a gimmicky card, Slith Firewalker is not really good enough these days and Mr Walking Grave is only the slightest of bits better
I want to take cues from Teysa Karlov: turn the sacrificed humans into other resources with Pitiless Plunderer, Requiem Angel, or Xathrid Necromancer
From there you get a mana boost, extra life, and cards, which is very hard to beat if the Henge isnt removed from the game
He's a guaranteed 2 lore when you play him, even if your opponent removes him immediately
Toski, Bearer of Secrets really shines in go-wide strategies like Tokens or Elves, but works perfectly well in most creature decks
To refresh you about the criteria I'm using to rank cards from each game subset: Honorable Mention - These usually will be a cycle or group of cards that are great but don't quite measure up to the "best" in the categories we have chosen to cover