Talk:Radiant Stream!/@comment-24791318-20151012024138/@comment-24791318-20151012030843

you don´t need to know your opponent has an impact to use defense spells. It´s about the same thing as playing against a world with a spell nullifier(star dragon world is one of them anyways) you shoud just use your defense spells earlier. There´s also a few cards that can be cast in response to this impact, like Quiescence of Cassiade and Chillax.