Answer:
What comes once in a minute, twice in a moment, but never in a thousand years?
Stealthy as a shadow in the dead of night, cunning but affectionate if given a bite. Never owned but often loved. At my sport considered cruel, but that's because you never know me at all.
Whilst I was engaged in sitting. I spied the dead carrying the living
I'm sometimes white and always wrong. I can break a heart and hurt the strong. I can build love or tear it down. I can make a smile or bring a frown.
When Iβm metal or wood, I help you get home. When Iβm flesh and Iβm blood, In the darkness I roam.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?