Like a lot of folks, I was concerned a broken Planeswalker or two would have made it into the War of the Spark file, but the thirty-six walkers of that set, even Teferi, all paled in comparison to the boogeyman from autumns Eldraine: Oko, Thief of Crowns
Firstly, you can currently only trade cards of a one Diamond, two Diamond, three Diamond, four Diamond, one Star, two Star, one Shiny and two Shiny rarity
It is also good against decks that need specific cards in the graveyard
4 Perennation = Cant Lose Secnario Standard/Commander Maybe less of a combo and more of a strategy, but no less effective when it comes to winning a game, the combination of Prennation and Herald of Eternal Dawn can stall out a game in your favor and put your opponents in an inevitable loss situation