If you manage to Surgical away both Grapeshot and Empty the Warrens, they probably cant find a win, sure, but only getting one isnt enough
Muddle the Mixture Merchant Scroll Mystic Tutor Enlightened Tutor Worldly Tutor Wild Research Summoner's Pact Eladrami's Call There are of course a whole selection of tutor cards across all the colours, none come close to Vampiric or Demonic
It can depend on rarity, popularity in competitive formats, or simply how striking the artwork is
Also worth noting: the awesomeness of Avons alternate-art Lorwyn basic lands was too good not to share with the rest of the world, and so the five pieces of promotional art made the jump to regular printing with their inclusion in Magic 2011
How many copies these decks end up playing, and with exactly what configurations of creatures, will probably take some time to iron out