Introduces new members/support for the "Abyss Actor", "Abyss Script", "Archfiend", "Branded", "Bystial", "Chaos", "Dogmatika", "Despia", "Evil Eye", "Galaxy", "Galaxy-Eyes", "Generaider", "Gishki", "Icejade", "Kashtira", "Kuriboh", "Labrynth", "Ninja", "Ninjitsu Art", "Number", Number C", "Numeron", "Photon", "Plunder Patroll", "roid", "Scareclaw", "Springans", "Swordsoul", "Tearlaments", "Therion", "Tri-Brigade", "Vaylantz", and "Welcome Labrynth" archetypes, as well as the Albaz Dragon, Broken World, and "C" series
Simple and straight-forward, Craterhoofs ability activates when it enters the battlefield as opposed to being cast, giving green decks a win condition that could either be hard-cast or cheated it into play with cards like Natural Order or Tooth and Nail
And then, of course, there's what you could draw
There are varying reasons for this