Level One (Gimmicks and Online Instructions) by Christian Grace
Sell out at Blackpool 2019
Package is a white box that slides open with a foam cut out holding the gimmick. Package includes:
gimmick (long thin white plastic piece with groved lines on each side). It is placed under a card (not included) making it look like it is a few cards or more cards in a deck based on the way it is turned.
Online instructions (visual, no speaking but does have english titles for clarification)
Only prep needed is to pencil all sides to make the groves stand out.