Bosh saw most of his play in mana ramp artifact decks rather than cheat in ones
#36 Of course Sirlin's card is all about yomi
Hold my beer, says Sephiroth, the Savior, whose cosplaying as Atraxa, Grand Unifier is good pretty much everywhere
Yes, it's a hummingbird holding a bur, but don't let its flimsy armament fool you into thinking this Bird Scout doesn't have what it takes
Additionally, Kozilek's Command has shown up as a four-of in all of the Eldrazi Ramp decks, shooting the card up to the $10 range
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)