This just happened to me too. The other player was attacking me with creatures and it found them as valid targets but I did not have any creatures and it would not allow me to submit zero targets. The card says that you may move the counters not that you have to move the counters so you should be able to submit zero targets.
This just happened to me too. The other player was attacking me with creatures and it found them as valid targets but I did not have any creatures and it would not allow me to submit zero targets. The card says that you may move the counters not that you have to move the counters so you should be able to submit zero targets.