With plenty of draw triggers along the way, your hand stays stocked while your battlefield grows
You can filter cards by Pokemon, then have the computer build a deck around the Pokemon you choose, and then tweak it however you want, or you can build a deck completely from scratch it's up to you
They could ban Vivi in Standard, in which case everyone who spent a lot of money on Vivi cards (currently going for like 40-55 bucks each as of this writing) would be pissed off, although Id argue that if you bought Vivi knowing what was happening you factored that in as a possibility
They are Silver Mirror, Silver Bangle, Eviolite, Exp
Two theme decks shipped with the release: Flamemaster and Stormshaper
Getting to take the Initiative for cheap provides an easy path to victory, so long as you can protect yourself