Once its on the battlefield, the game plan from there is straightforward: keep up instants to draw cards, protect the Lord, and create wraiths
Several factors influence Battle Styles card values: card condition (mint cards worth 3-5x more), rarity (holographic and rare cards command higher prices), first edition status, PSA/BGS grading scores, and market demand for specific Pokemon
If the artwork is contained to the standard box, you may be looking at a Double Rare card instead
While other cards that discard your cards give you some immediate benefit on its own like summoning creatures, drawing cards, or also force your opponent to discard cards as well, One With Nothing has no direct benefit by itself and you need other cards to make use of it