Why is the Fantasticar ok but Survival-Vengevine not ok?
Title
The only real reasons I can think of is that we have 4-5 Fantasticar shells right now, while Survival of the Fittest likely would be a single archetype.
I do not believe Survival has been problematic since at least Abrupt Decay, and certainly not in the post-Frog era of Legacy.
Today's start of Fantastic Summer has me more demotivated than ever to play this format.