65x100mm card sleeves - Clown Standoff "7 Wonders" Sleeves - Mayday

If you Special Summon 1 Fusion Monster (and no other cards) by a Spell Card or effect (except during the Damage Step): You can target that monster

You can add madness cards to your deck like Big Game Hunter or From Under the Floorboards

Furthermore, the game's price is far more reasonable for players than games like Yu-Gi-Oh and Magic the Gathering, because the best deck in the format is only about $100 unless players look for alternate art copies of the cards they need

You (literally) cant lose

There are two reasons for this: Those cards are in limited supply

Considering that there were multiple types of special energy in this set at the time, it was a very useful card to use that could also get a chuckle out of anyone who played with or against it