Top-level competitive play is called Core Constructed and will not allow players to use any cards from the first four sets of Lorcana
As mentioned above, the issue with playing a deck like Faeries is that your bodies are small, and trying to kill multiple players without dying on the back swing is difficult
You can even just re-equip it onto a more suitable threat and still be left with a 2/2 as well
The combo utilizes the following cards: Prosper, Tome-Bound Ashnod's Altar Planar Void OR Flaying Tendrils OR Cry of the Carnarium Eternal Scourge Grapeshot OR Tendrils of Agony This combo works as such: Have all permanents among the combo pieces in play as well as at least 3-5 mana available
One of this deck's big problems is it often strays from the Inventory-and-Item theme into Ally and Hero cards, but Cass is one of the few non-Inventors that is absolutely essential
Once it's on the battlefield, you never have to put it in danger in combat