There are two ways:
1. Get as many dead branches as you can, kill the rest mobs and collect 7-8 Zakudams near you. Eat bubblegum and kill them.
2. Farm old card album and you should find one within 50 of them.
Both methods are luck based and it depends when will you get it, I found 2 zakudam cards in just 50 card albums. But these methods are wayy better than paying 3B for something you can acquire very easily.