Forum:What do you think are the most versatile cards?

The most versatile spell, monster, and trap card? For a monster I would say Cyber Valley, 3 effects that are very useful. Book of Moon for spell, it can be used to stop most situations: attacks, mirror force, bottomless trap hole, brain control...etc. I'm not sure about trap cards, but I would say Solemn Judgment. Too costly for my taste.Oreos74