hi guys its 0.34 am here and my tourny starts at 10.30 wooo. need advice. can i set cyber valley and activate its effect when someone attacks while its face down? or does it need to be face up? replies asap would be appreciated as annoyin monsters such as this and penguin soldier are a vital part of my hold-em-off-while-i-get-dark-magiain-out deck :)

thanks guys i know you wont let me down

All three of Cyber Valley's effects can only be activated while Cyber Valley is face-up.