Veteran Hearthstone players remember a spell named Gang Up from the old days. Well, Togwaggle's Scheme is an improved version of that spell. It costs less than Gang Up, and it can potentially put far more copies of cards in your deck than three.
Both Pogo-Hopper and Malygos Rogue archetypes will have a blast playing this card. It's not only good for executing some fun combos, but also in preventing your deck from fatigue damage.