The official deck construction rules for Commander (nee EDH) at say that 'A card's colour identity is its colour plus the colour of any mana symbols in the card's rules text.' How does this apply to dual-faced cards with faces of different colors, such as Civilized Scholar / Homicidal Brute out of Innistrad or Elbrus, the Binding Blade / Withengar Unbound from Dark Ascension, where the color of the transformed face of the card is different from the color of the 'main face'
Blackmail is obviously pretty strong--they have three cards in their hand, you get to (often before they get a turn) look at these cards, and remove one
Blast from the Past uses the graveyard symbol used in Odyssey block to signify that the card has utility in the graveyard
It does only target nonbasic lands, but many decks in Commander play plenty of nonbasics, with some not playing basic lands at all
Looking back, I'm so glad Brady steered me away from making Gnomes
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