Professor Onyx as my only win condition, while effective, got a little old. So a couple weeks ago I went hunting through other cards looking for a good artifact or enchantment to run as a win condition, to dodge more removal. I wasn't around during Kaldheim, so this card was new to me:
The creature side is a little meh, but that artifact side is such a good clock. It's won me more games than Onyx has since I added it. And the creature side even has found it's uses. So now I run 2x Professor Onyx and 2x this. (Oh, and Hall of Storm Giants + Castle Ardenvale in case everything else falls apart)
But then I've still been wishing for an Enchantment win condition to run 2x of, too, but the closest thing we've got in Historic is Revenge of Ravens or Ill-Gotten Inheritance. I ran Phyrexian Arena for a bit as an engine, even if it's not a wincon, but the number of games where it ended up being more of a hindrance than a help ended up making me pull it out.
This card just popped up on spoilers for New Capenna tho:
And at 3 mana, I think that's about perfect for my uses. My deck is itching for more card advantage anyway (even tho ability to dig is already one of its greatest strengths). It's not going to get the win on its own, I suppose, but it will definitely help get me there. I'm surprised this card is 3 mana, if it was 4 it wouldn't be nearly as playable.