pokemon card air freshener Cubone Hand Sublimated in our workshop in Lancaster Dragonite Pokémon Card Air Freshener

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)

Spit Flame

Nicol Bolas, the Ravager Just because a card is the obvious #1 doesn't mean it's not #1

Several cards in the set refer to modified creatures and reward you for making your presumably already awesome creatures awesomer