A) Kaldring in the Jorn deck, even with all the any-color ramp, is probably too big an ask. Having a two-off-color card be a rare is too hard in Limited. Probably why Jorn is not a high pick in Kaldheim draft. So Blessing of Frost is the green 'spend snow mana on it' rare, and it's got a picture of Jorn on it, so it'll do.

B) Struggle for Skemfar is the only 'story spotlight' card in the entire cube. It's just a little weird for Jorn I guess. The other two choices are Roots of Wisdom and Mammoth Growth, and the Mammoth is at least a combat trick.

C) Everyone's lands should be special, so maybe only Esika gets a Crystal Grotto, and so Tibalt gets his second tapland, Immersturm Skullcairn back. To make up for it I switched out the Shadowmoor basics for Jund basics, which as far as I can tell is the only basic Swamp with lava in the art. Hopefully the cinderkin would feel at home on Jund.