absol pokemon card holo - Team Magma vs Team Aqua 96/95 097/189 / Rare Card Type / HP / Stage Pokemon Card - XY Promo

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)

Olivia Voldaren Olivia Voldaren lets you convert your opponents' creatures into vampires and then steal them over the course of several turns

from this point on, it gets quite expensive

There are other little updates included as well, so poke around and check it out