I feel like Siren is one of the weakest promo cards because the ability of the card is so situational. The end game points are nice but this is taking up valuable deck and hand space on the off-chance that a companion card is available to grab when you play it. Let’s say that on the off-chance that a companion card is available, that doesn’t necessarily mean that you want to add that card to your deck. You might now be adding two cards that don’t help you, further devaluing those that are helpful since you won’t see them as often. The completionist in me is stoked that the Siren is in the deck but the strategist in me will almost always pass on this card. I only recommend the purchase of this if it’s in the very beginning of the game so you can add cards to your deck just to be able to do something (but this is risky as I mentioned earlier) or you’re almost out of the game and just want to add some points to your score.