The low Level monsters only apply this effect if Pendulum Summoned or flipped up, while the high Level monsters do not have any restrictions
Even when faced with something that can effectively disrupt them, pendulum magicians can be surprisingly resilient with a decent hand, typically able to play through 1 or 2 interruptions without much difficulty
The Costco bundle, for example, includes specific cards and oversized promos that are unavailable in other packs
The former certainly is the larger factor, with the rarest pulls like alternate art cards, or secret rare gold cards, always fetching the highest prices
1, Sacrifice Sterling Grove: Search your library for an enchantment card and reveal that card
Pair this with the likes of Weavile ex (more on that later) and youre laughing