User blog comment:SpiritedDreaming/RWBY: Attack on Kevin Tower Defense Game/@comment-26397825-20160920115354/@comment-25936766-20160920160317

The silver eyes were a Deus Ex Machina, so I believe they have the right to be luck-based here.

The problem with your idea is that it is too luck-based to be fun. No side would have a real chance of summoning either Glynda or Cinder. Glynda is easily cancelled by even 1 user, while with Cinder we'd have absolutely no idea what to do, which is just frusfrating in both cases.