Barrier Statue Of The Stormwind This card was banned specifically because its a really good floodgate in Floowandereze decks, and causes extremely unfair match-ups in which an opposing player cant actually do anything
This may be done at anytime
However, its key contribution is its support for the Blue-Eyes White Dragon, Black Luster Soldier, and Dark Magician archetypes
Basic Energy cards fulfill costs for attacking and retreating and don't have additional effects, while most Special Energy cards have additional effects
In any one game, using different elements of the strategies above will be your best bet to win the game
There will be turn-based boss fights (that can kill you!), new characters, more playgroup-politics and of course tons of rewards