Usurper of the Unruly

Blixes you control are black.
Black creatures you control have vigilance.
{1}, Sacrifice a black creature: add {b}. If you
sacrifice Usurper of the Unruly this way, also add
{c}, and Blixes and black creatures you control
gain vigilance until end of turn.
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Angles are an embodiment of order, produced by the
leylines. Demons are an embodiment of chaos of the
same maker. Yet Blixes, also of the leylines,
sit just between in an organized chaos.