Looking for a designer to create video ads for Adwords

We're looking for a marketing savvy and experienced graphic designer. who can originally design and create new video ads on demand (possible long term relationship) to advertise our Mobile Gaming Portal . Designer must have experience with gaming portals and traditional banners for Mobile advertisement , also designer should have understanding of copy writing and Media Buying mechanism . Please attach previous works and portfolio for examination (Banner and Video ads that you created for Media Buying ) Experience with creating ads for games and gaming services is a must . Experience with Adwords and Youtube ads is a must . Thanks