Series 3 is dropping tomorrow exclusively through GameStops brick-and-mortar locations
If its a cost, it happens during activation or casting
Overall, Heidegger, Shinra Executive is an expensive and slow card to play, and can really stagger progress during gameplay , even if its abilities seem positive, making it inapt to work in this particular Magic: The Gathering Final Fantasy set
Urdnan, Dromoka Warrior I dont have a ton of faith in a mono-white +1/+1 counter commander in a world of green powerhouses like Bristly Bill, Spine Sower, but I kind of dig how fast it is to get Urdnan, Dromoka Warrior down with a counter on it to get started
The other resource, and this one is particularly good for finding unloved or underappreciated cards, is Scryfall, specifically the advanced search