This expansion was an opportunity to create some of the most fun card designs that the Pokemon TCG has ever seen, but the cards revealed so far have been derivative and, Im sorry to say it, mostly boring
GX/VSTAR Attacks: Some powerful Pokmon (like GX or VSTAR cards) have a special once-per-game attack that can turn the tide of battle
MetalGarurumon Another Super Rare to make this list, MetalGarurumon, is a Mega Cyborg that is all offense
If you suspect that your opponent will sideboard in some lifegain effects (which are really good against burn), consider bringing in this enchantment to shut those cards down
Central Elevator is a room tutor and Promising Stairs is the actual wincon, though you'll need a supporting cast of just about every playable room in Magic right now, which also means you're probably playing a Marina Vendrell Commander deck