Mechanically, they tend to have abilities that emphasize their love of consumption, gaining temporary stat buffs when you, their controller, makes some kind of sacrifice, from sacrificing forests to, yes, skipping your next turn
However using that effect will stop your Toon Black Luster Soldier from attacking that turn
Its value comes not only from the affection for the plant-type Starter Pokmon, but also from the difficulty of finding one in pristine condition after more than two decades
Each of these archetypes was an instrumental part of the last few years of the competitive scene, with one of them (Tearlaments) being the central deck of a Tier 0 format
Shiny Pokmon are every collector's dream, and people go to massive lengths in order to obtain one
It won't win any games by itself, but Starting Town is exactly the sort of subtle card that quietly keeps a deck running