Cards like Dragon Tempest, Blood-Chin Fanatic and Boltwing Marauder too often hinge on the emergence of a specific linear deck, whereas flexible and powerful cards like Snapcaster Mage and Abrupt Decay offer up multi-format appeal that can be tucked into a myriad of decks
For beginners, its recommended to build your deck with about 15-20 Pokmon cards, 15-25 Trainer cards, and 15-18 Energy cards
There are just enough strong cards that you dont need red or white unless you see a sick rare, and I enjoy the increased consistency
Bronzehide Lion is a bit mana hungry, but serves well as both an aura target and a returning aura as a means of protecting another target
Undead Servant is definitely below the curve, and despite the potentially high upside (which gets higher in Limited since you can run as many as you want) it wont always be worth playing