Some of these could use update verbiage.
Andvari "If you have completed at least 6 Conquests, gain 2 Gold onto your deck; otherwise gain a Gold and Surtr's Fire."
Baldr "Now and at the next turn's start +1 Coin, +2 Buys. While this is in play, roll upon gaining a card. Roll 1-3, gain the card to your hand. Roll 4, also gain a Silver. Roll 5, trash the gained card. Roll 6, return gained card to the Supply and gain a Silver."
Coastal Raid "+2 Coin; You and left-player reveal the bottom deck card. If your card costs less, gain a Gold. They return thier card. You put your card into your hand." 15 less words
Valhalla seams overpowered to start, maybe nerfing it like: "Worth 1 V-token per completed Conquest. The first time this card is played this turn: +1 Card, +1 Action."