A Giveaway/subscribe Plugin (chances to win)

Hello,

We really hope someone can help us. We are looking for a pop window that we seen but not anle to fins any more.

It was a window that popped up. Where you had a change to win $50 (gift card). All you needed to do is subscribe to the newsletter (via email) and then also share to your social media for additional chances to win.
I wished I saved it. and then we could have shown you all what we are looking for.
If any one knows of any plugins that can do this please let us know.