A commander's color identity is only composed of the set of colors the card is and any mana symbols appearing on the card, meaning Savra, Queen of the Golgari
is BG. You can only run cards with a color identity that is a subset of the color identity of your commander, meaning only strictly BG cards can be run in your EDH deck. Mercy Killing
has a color identity of WG; since white is not in your commander's color identity, you can't urn Mercy Killing.
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CrazyLittleGuy says... Accepted answer #1
No.
A commander's color identity is only composed of the set of colors the card is and any mana symbols appearing on the card, meaning Savra, Queen of the Golgari is BG. You can only run cards with a color identity that is a subset of the color identity of your commander, meaning only strictly BG cards can be run in your EDH deck. Mercy Killing has a color identity of WG; since white is not in your commander's color identity, you can't urn Mercy Killing.
September 30, 2014 2:53 p.m.