Newer support cards, released mostly in Duel Overload , focus on negating the downsides of the original "Malefic" monsters, making it easier to swarm the field
Youre hiding from your enemy and just about ready to shoot
While there's a case for "mono-blue-stealstuff" and "ooze-combo" to be declared the most powerful, my belief is it's the most broken commanders that enable the most broken decks
If any of your creatures have 7 or higher Power, at the end of combat, they untap and are able to go into combat one more time
Note: Decade (Xtra HERO Vagrant X) is really just here as the "Crossover" HERO, much like Wonder Driver
The design team buckled down and came up with some great themes, and the development team made those themes really work