This is a deck for the "Double Down" seasonal mode. It features lots of mages, lots of pings and valuable use for rarely used cards like Yennefer: Conjurer and Dethmold. Here's how to use the various provision clusters:

12: Erland is meant to be played right at the beginning. Double Erland with double deck size absolutely speaks for itself. If you don't draw him, use the Cursed Scroll or a leader charge on the second turn instead.

11: Gerhart is pretty good I'd say. Use him as you see fit. If you have some Cintrian Spellweavers on the field and your NG opponent played Duchess's Informants to copy a mage, you can spawn Teleportation right after play and replay the informant. That's multiple procs on the spell and mage mechanic.

9: Play Yen: Con as soon as you have a good board for it. Donimir will be her protective white knight.

8: Play this cluster later. First you want to have Hubert out of your deck, then you want to have some mages on the board for Dethmold. Slightly interferes with John Natalis who wants to play his tactics rather early, but you will find the right moment

7: More mages. Can be played anytime.

6: Utility cards. Can be good leader targets as soon as you need them.

5: The core of your engines. Set them up as early as possible and dominate the round.

4: More engines that should come second after having the Spellweavers on the board. Ban Ard Students won't be revived so you don't need to stack up their patience endlessly.

For future updates:

See if the cards with the same provisions still synergize. Keep Erland exclusive in his cluster. And see what fancy mages got added to the game.

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https://teambanditgang.com/seasonal-mode/