There has to be a maximum number of agents that can be active at the same time.
When you already are at maximum number of agents and you want to play another one you have to select an agent that is then removed from the table and placed into the cooldown pile.
Reason for this modification: As soon as an opponent has a certain amount of agents active you can just concede. Psijic is far too expensive (provided it was picked at the beginning of the match) and you generally can only activate it once limiting any other action in most cases. If you are lucky you can activate it twice provided that you have sufficient gold in your hand AND the opportunity of a double patron action. Stock agent kill cards are far to rare and other patrons providing agent kill cards would have to be selected or they are so expensive that you need a lot of luck to grab it. This is why a lot of player just chose an agent spam strategy because there is NO way to prevent this.
Rhajin bewilderment card spam should come at a cost to the spammer
Re-activating Rhajin when in favoring position should have an increased cost for the patron spammer. This could be an increased gold cost or maybe a debuff, e.g. having to place a card from the hand into the cool down pile, a bit similar to almalexia
This spamming is by far too cheap and has too noxious effects on the other player. Not only does it break chains what it rightly does. It takes away one place for a gold generating card AND costs money to get rid of it.
Tank agents: Either maximum number active or a limited number of active turns
That's a bit similar to the first suggestion but takes account of the specific role and considerable power these agents have. Again this is because getting rid of agents is really really difficult.
Rhajin Pounce and Profit/Grand Larceny give too much gold
This is the single card that decides matches! It is fairly cheap 5g so it can in most cases be bought right from the start and gives an enormous advantage to the player who snatches it first. It is far too powerful. I know when my opponent has picked it before me I have lost the match. And this loss materializes almost every time. It is just too darn powerful for the comparatively ridiculous cost.