Hello,

How do I calculate the Reserve if I play Kings of Winter, the Frostfangs and the Strategy Card Wraiths in their midst?

Kings of Winter says it gives -1 Reserve. The Frostfangs do the same. But Wraiths in their midst say that every Enemy gets -2 Reserve, but with a minimum of 2.

If the enemy has printed 4 Reserve... how much does he have after this?

2. Wraiths applies a 'cap' (it's not a question of the order you apply them, the point is that Wraiths is subtracting 2 from their reserve AND ensuring their reserve cannot drop below 2).

If you haven't checked out thronesdb or cardgamedb, both have rules sections more active than this one; the latter has collections of existing rulings associated with cards (e.g. Wraiths in their Midst ), while the former has more discussions about the minutiae