Starnheim Unleashed Foretell is a new mechanic in Kaldheim that I am especially excited for in Historic
Assuming its turn three, you can now swing in with your Kiln Fiend, protect it with Force of Negation, Lightning Bolt either the blocking creature or the opponent, and then cast Temur Battle Rage to do up to twenty-three damage depending on other blockers and whatnot
Judith, the Scourge Diva Judith, the Scourge Diva does everything you want for an aggressive sacrifice deck
Its worth noting, Bearer of Silence is an excellent choice for decks that are not all-in on Eldrazi
For example, if an Elite Inquisitor (a 2/2 with first strike) blocks a Grizzly Bear (a 2/2 with no abilities), the Inquisitor deals damage before the Bear can, so the Bears dies and the Inquisitor survives 3 Vigilance Vigilance is the ability to attack without tapping
Goblins, Elves, Vampires, and Spirits seem like the decks with competitive potential, with Walls and a few others on the cusp