Vault
When played
- player will discard all Coppers and worse for +$1 (also excess terminal actions)
- if player has a Tactician in hand after drawing 2 AND has more than 0 actions left he will set aside the Tactician and one other card and then discard the whole hand for +$1’s, then put Tactician and the other card back in the hand
- if opponents have 2 cards in hand worse than Copper they will discard them UNLESS they have a Vault or Trading Post in their hand
Geronimoo's Dominion Simulator 
The vault can discard usable action cards when there are no actions remaining but a king’s court x king’s court has been played and the king’s court can play more actions. A slightly unusual problem but maybe the fix is easier than it looks?