Color identity is determined by all mana symbols that appears anywhere on a card. Because of the , , and mana symbols that appear on Obelisk of Grixis in its ability, its color identity is .
December 5, 2014
6:13 p.m.
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TheHroth says... Accepted answer #1
Color identity is determined by all mana symbols that appears anywhere on a card. Because of the
, 
, and 
mana symbols that appear on Obelisk of Grixis in its ability, its color identity is 
.
December 5, 2014 6:13 p.m.