The Dread Wight is the simpler of these two zombies, being a blue-skinned guy with some really awesome hair
Out are Chancellor of the Spires, Sepulchral Primordial, Gonti, Lord of Luxury, and Agent of Treachery
Wastes cards showed the Eldrazi titan Kozilek laying waste to Zendikar, adding a visual element to the story
Efficiency can be determined simply by the reward you receive at certain mana costs (Counterspell and Cancel do the same thing, but Counterspell costs less), the total payoff you receive from a single card (Hull Breach and Decimate are both good cards, but Decimate usually covers much more ground), or the payoff you receive in conjunction with other cards (Anointed Procession makes other token production cards completely absurd if unchecked, which is usually better than adding one more card that simply makes tokens like Spectral Procession in a token strategy)
DH: I think its safe to say youll see some characters making multiple appearances in the product and each is appealing to different kinds of players
The key decider as to whether The First Iroan Games works out for you is likely how your opponents creature removal interacts with chapters two and three