Help with riddle quick please?!

Question:

I have 2 faces, the same
i have 2 sides, one is plain
with my four brothers we reign
but they all think im insane
because i stab myself in the brain.

Additional Details

3 weeks ago
apparently king in playing cards is close

3 weeks ago
best answer will go to army vet for king of hearts..... thats the answer

Answers:

The King of Hearts

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