u/iribuya

I had a card with two slots that said 'make a coin card'. That card I doubled. Next I started using this card in a bunch of different battles until I had about 50 Coin Cards. I would have continued, but it was basically impossible to tell which card was where.
Then one round I made a combo while clearing all the cards on the right side, zo only the Wild Coin Card and some other Wilds were there. Then started using them and you can see the result in the movie.

After this post I will upload some of the screenshots of this broken end-run where I ended up with 5 million coins and only stopped because I got lazy :D