So I played ranked from beginner until D Rank. Played entirely using Amulet Haven with whatever legendaries I could get.

The results were:
>16 matches - 11 wins 5 losses
Opponents:
>Portalcraft: 4 matches (3 wins 1 loss)
>Dragoncraft: 4 matches (2 wins 2 losses)
>Swordcraft: 3 matches (1 win 2 losses)
>Runecraft: 3 matches (3 wins)
>Abysscraft: 2 matches (2 wins)
>Forestcraft: 0 matches
>Havencraft: 0 matches

Still no idea what Forest even plays here because I haven't seen a single one and I can't be bothered to read their cards.
Right now Sword and Dragon feel the strongest, but it could be because everyone is just playing cheap decks where just spamming overstated followers is the best. Dragon specially feels impossible to beat if they open well enough.