That means once The First Sliver comes down, you're likely to cheat out card after card with Cascade, assembling a formidable force all at once, to your opponents' horror
Its toughness (the second number) is the amount of damage that must be dealt to it in a single turn to destroy it
In short, Shichifukujin Dragon was created to commemorate the opening of the DCI Tournament Center and 1996 World Champion is exactly what it says - the card was created as a prize for the winner of that tournament (Tom Chanpheng)
Even then, by modern Pokemon card standards, the damage dealt is pretty insignificant
Rarity: M #:286 Card Type: Legendary Creature God // Planeswalker Tibalt P / T: 2 / 1 Casting Cost: 1B
In fact there are examples of cards that could be considered strictly weaker than others that gain power with the right build (ie: Diabolic Intent vs Demonic Tutor in an Aristocrats style deck)