Yes, TRICKS is a Scrabble word!

Letter values in Scrabble US: T 1, R 1, I 1, C 3, K 5, S 1.

Is it a valid word?

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

a cunning or deceitful action or device
a period of work or duty
an attempt to get you to do something foolish or imprudent
a ludicrous or grotesque act done for fun and amusement
an illusory feat; considered magical by naive observers
a prostitute's customer
(card games) in a single round, the sequence of cards played by all the players; the high card is the winner

Also: fast one, put-on, magic trick, conjuring trick, flim-flam, play a joke on, play tricks, pull a fast one on, play a trick on.