Given how easy it was to acquire, there are likely quite a few copies of the card in the game, although there are two things that help to contribute to its rarity
Disney Lorcana TCG: Whispers in the Well Booster Box
Depending on your luck, your opponents or your Pokmon might be asleep the entire game making Asleep decks one of the most fun or aggravating decks to play in Pokmon TCG Pocket
Ninetales has graced many regions, from Kanto to Alola, where it also takes on an Ice/Fairy-type variant, showcasing its adaptability and enduring charm
The Master of Keys gives all your enchantments escape, giving you another reanimation avenue
Either side cast separately helps Death Toll's overall plan , either milling cards or dealing damage while other cards mill