Bug with Kronx and tog waggle scheme

I played a match where kronx was played then tog waggle scheme on the following turn. Then he was able to play multiple kronx’s on subsequent turns. First kronx was 6 mana, then the subsequent ones were zero. Am i missing something. I have the replay but the forum wont let me link it…any suggestions to see whats going on?

Did he draw them with Galakrond or Wondrous Wand? If he did, they would cost zero.