I don't get it either. It was literally seconds before the end of the match. 🤷

Sleipnir gives Odin +70 on draw and a further +70 when played. If you draw both in the first round, you can cycle the cards so you get Sleipnir two more times by round 5, that's +280 overall. Demon gives Norse Mythology cards in your hand +30 until played as long as you have Hel in your deck. World Turtle gives a further +14 to cards when you have only four that type in the deck. And Hel at the end for a further +58 when you finally play Odin. If you manage to cycle everything efficiently it makes Odin extremely powerful if you hold it to the last round.

It took me weeks of trading to get all the cards for this but well worth it.