Sentient Allomancer

HartheGate Allomancer is all colors except black,
and it cannot become black.
Other knights and artifacts you control cannot
become black.
Other knights you control get +1/+0 and gain
vigilance.
Other artifacts you control get +0/+1 and gain
hexproof.
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"It shimmers with the belief of flawless unity."
—Captain Tammeron