Continue the subset of cards that don't care if you connect with an opponent, but rather look to any combat damage dealt, so these become super effective: Five-Alarm Fire, Holy Avenger, Sword of Hours, Lost Jitte, Tamiyo, Field Researcher, and the infamous Umezawa's Jitte
If Champion of the Clachan is countered or otherwise fails to resolve, the beheld card will remain in exile indefinitely
It ported over to the UW Humans and Bant Company decks of Shadows over Innistrad Standard, and even broke into Modern for a time (back when Celestial Collonade and Vendilion Clique were the bread and butter of the deck)
Just a little later, an article from ScreenRant showed both, plus the participation version for the Set Champs but no play mat
Their interconnected nature is represented by the harmonize mechanic, which allows instants and sorceries to be cast from the graveyard
The lovely folks at TCGPlayer have provided some Spectacular data on the most popular cards players are buying ahead of the full release this Friday, September 26