This SFMC Custom Content block allows you to add Giphy content blocks into your Email Studio Editor. Do note that you will also need to create an Installed Package in your MC Account and a new Heroku project to host this.
For more information, visit: https://developer.salesforce.com/docs/atlas.en-us.mc-app-development.meta/mc-app-development/content-sdk.htm
Christopher Thorborg (Salesforce Solution Engineer) Lachlan Ross (Salesforce Solution Engineer)
Thanks to Chun Tat (CT), SF Solution Engineer, who's work on the Sitecore custom content block code we used as a starting point for this Giphy work. https://github.com/chuntat/PUBLIC-Sitecore-Custom-Content-Block