The ward ability, great stats, and fantastic trigger ability all contributed to just how powerful Vein Ripper became
Pikachu has the following attacks: Gnaw - 20 damage
Couple that with the instant-speed availability of Survival of the Fittest's activated ability, and it all combines into a card that can rapidly turn all the creature cards in your hand into the perfect combo assembly necessary to close out the game
A little bit of top-of-the-library control will help, but youll still need to put some decent amount of mana into the effort
This means that the deck uses tons of GX and EX Pokemon in order to make the most out of Mewtwo & Mew-GX's Ability
The cards in Feline Ferocity that most help the Go Wide strategy are the opposite of what the Go Tall strategy under Arahbo, Roar of the World wants: in this case, we want anthems that beef up our entire army (Hungry Lynx), cards that have triggers when a creature enters the battlefield (Qasali Slingers, and cards that care about the number of creatures we have (Kindred Summons)