Yes, RIFFLED is a Scrabble word!

Letter values in Scrabble US: R 1, I 1, F 4, F 4, L 1, E 1, D 2.

Is it a valid word?

RIFFLED is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

twitch or flutter
look through a book or other written material
stir up (water) so as to form ripples
shuffle (playing cards) by separating the deck into two parts and riffling with the thumbs so the cards intermix