PvE tournaments don't exist; where have you heard this? As far as I know, PvE means "Player versus Environment" and it involves you fighting CPUs. PvE tournaments don't exist.
A while back, the Sundial was basically the best card in the game (right next to the Otyugh). It stalled 2 whole turns for cheap. Then, in an update, Zanz made it stall for only 1 turn. This was the Sundial Nerf, and it changed the face of False Gods forever.