This is not that simple, SC is far to be the only way to abuse spy, Caretaker, Emyr, Decoy ect...
If you win the round one card down, then you can reverse tempo at the cost of 13 pts, that fit into the suggestion i've made and is a strategic option to do so, same as carry over, i'm ok for that because you get a fair advantages for a silver card at a fair cost.
If you win the round at even card then it is an issue because you will force your opponent to play a card and not only deny his carry over but take a sur card advantages since your opponent cannot pass. Which is way too strong as advantages for a silver card at no cost at all.
Since it is a kind of gameover mechanic and the only answer possible is to have his own spy in hand, you first jeopardize the entire game on the single fact one player draw his spy or not, plus you make the spy card a mandatory card that will be present in every single deck created which completly ruin some build and make the meta so thin that we keep see same deck over and over again.
Spy card is good and i not say they should be deleted, i'm saying that they should never been able to give a card advantages, they should allow you to reverse the tempo (so play the card immedatly if you are even or higher in card, or can keep it if you are down in card).
If you win the round one card down, then you can reverse tempo at the cost of 13 pts, that fit into the suggestion i've made and is a strategic option to do so, same as carry over, i'm ok for that because you get a fair advantages for a silver card at a fair cost.
If you win the round at even card then it is an issue because you will force your opponent to play a card and not only deny his carry over but take a sur card advantages since your opponent cannot pass. Which is way too strong as advantages for a silver card at no cost at all.
Since it is a kind of gameover mechanic and the only answer possible is to have his own spy in hand, you first jeopardize the entire game on the single fact one player draw his spy or not, plus you make the spy card a mandatory card that will be present in every single deck created which completly ruin some build and make the meta so thin that we keep see same deck over and over again.
Spy card is good and i not say they should be deleted, i'm saying that they should never been able to give a card advantages, they should allow you to reverse the tempo (so play the card immedatly if you are even or higher in card, or can keep it if you are down in card).