Is this a legal Youtube giveaway?

So I want to hold a giveaway on my Youtube channel of a $25 Itunes gift card that I found while cleaning... I don't use Itunes myself and I feel bad throwing it away, so I wanted to give it away instead. I've added the video here where I talk about the giveaway (I haven't uploaded it yet to my channel), so if you could please provide input on whether or not this would be allowed, I would be very grateful.:)

1. You have to be 18 years of age or older

2. You have to be a subscriber to my channel

3. You have to leave a comment on the video about what your favorite Ghibli film is and why. (this is going to be a companion video to a movie review I do of The Wind Rises).

I've seen other Youtubers do similar things, but usually they're homemade jewelry or a custom T-shirt or something rather than an actual gift card with monetary value.

Also, I've Googled this and it seems that whether or not you're a Youtube partner makes a difference. I am a verified Youtube partner.:) Is it legal for me to hold this giveaway?

Thank you so much in advance!