Unlike normal limited, where you have no control over the cards that you'll open, you do have a little bit of control in Jumpstart: Historic Horizons limited (being able to pick which packs you want out of the three offered)
Since Carmen cares about any permanents and not just creatures, it opens the door to lots of interesting synergies
Of these original Kaldheim cards, many stood out, such as blue staple Alrund's Epiphany
Thespius Bloodblaze Thespius Bloodblaze Thick as Thieves Thief Catcher Norun Thief in the Mist Thieving Little Pluckers Thieving Little Pluckers Thira Anvilash Thoglos Thomas Slash Robinson Thorn in the Side Thorns Thorns Thorns of Nordrassil Thornwood Staff Thoros the Savior Thrall Thrall Thrall of Vanity Thrall the Earth-Warder Thrall the Earth-Warder Thrall the Earth-Warder Thrall the World-Shaman Thrall's Desire Thrall's Doubt Thrall's Fury Thrall's Patience Thrall, Guardian of the Elements Thrall, Guardian of the Elements Thrall, Warchief of the Horde Thrall, Warchief of the Horde Thrall, Warchief of the Horde Thrandis the Venomous Thrash Thrash Blade Threadlinked Chain Thrill of the Hunt Throat Slasher Throat Slasher Throk the Conqueror Throk the Conqueror Throne of the Tides Throne of the Tides Throne of Thunder Through the Dark Portal Throwing Starfish Throwing Starfish Thrug the Hurler Thud

So always weigh your decisions before picking the strongest Pokmon, prioritize evolutions, and base Pokmon
The game gets a new event every week, which can be either a Wonder Pick, Bonus Week Mission, or a Card Drop event