Youre already incentivized to run mass-damage effects like Thermo-Alchemist here, and a single Lightning Bolt can represent a 6- or 9-mana discount for the turn
Unlike Theros and Tarkir, which had to change their name from the plane that represented our hint at the future plane in Planechase (Arkhos and Mongseng, respectively), we were able to keep the name Kaldheim when we made the 2021 set built around Norse mythology
Cauldron Familiar is also particularly awesome here, since if it dies (say, as a chump blocker), you can return it to the battlefield by sacrificing a Food, and if you do it on your turn with Gyome on the battlefield, Gyome will replace the Food on your end step
Think of it as a convenience fee, as not everyone is necessarily willing to sell off cards they dont want
This promo event will apparently give players a new version of the Venusaur card, potentially giving players an even tankier iteration that hits a little harder
Delighted Sightseer is from last set, but you should be able to trade for a couple more he works well here