I think not, but Grunn, the Lonely King has always been a card I like for the sheer upside and hope
First, like Sunscourge Champion, you can play Naban on Turn 2 and curve into Champion of Wits on Turn 3, which is a great start for any deck but especially a deck that can abuse the graveyard in some way
You can only pay a creature's omen cost while it's in your hand
We made some exciting new cards with the miracle mechanic from Avacyn Restored , for example
Manifest dread, that's a new mechanic in Duskmourn, but it's basically just Manifest only you get a bit more choice about what card you get to play face down
Timestream Navigator is a really neat design for an extra-turn card, but it's rather clunky by today's standards