U-375: The enemy discards the lowest cost card in their hand.
Case Yellow: Deal 1 damage. Your units get +1+0. The enemy discards a random order.
Wolfpack: The enemy discards the highest cost unit in their hand. Draw a card.
Annihilation: Destroys an enemy unit that costs 5 or less. The enemy discards a random card that costs 5 or less.
In this way, Wolfpack remains a very strong card, as it replaces itself and always hits the highest cost unit in the enemy hand (272, Tiger, Leo, B-17s). Case Yellow can still hit draw cards and powerful orders (CM), but it doesn't replace itself (because it already has two additional effects). And U-375 starts to be a support discard card to ensures you won't discard a cheap order with case yellow or annihilation. And if the enemy has only 1 or 2 cards in his hand, it can discard a high cost card as well.