Masked Beast Des Gardius has always been one of my favorite monsters in all of Yu-Gi-Oh
But for some a big part of that fun comes from winning, especially in a competitive environment and a game driven exclusively by competition like Yu-Gi-Oh
Its worth remembering that this card has a severe downside in that it can damage you too
The success stems from more than the cards, though, as the creators have produced various manga volumes, TV seasons, and even video games capitalizing on the concept
I would never need so many, as you can have a max of three copies of a card in a deck at any given time (unless it's Restricted at one copy or Limited at two, clearly indicated when deckbuilding)
that target loses 400 ATK for each "Hero Kid" in your Graveyard, until the End Phase