Haha! Same here. Here's the 1 million-DEC tip --> Use your DEC to buy/upgrade your GOLD cards. The gold cards earn bonus DEC (%5 per card per won battle), and so with the gold cards you don't actually LOSE/SPEND your DEC, but actually INVEST it into cards which will earn DEC into the perpetual future. You're welcome...
Haha! Same here. Here's the 1 million-DEC tip --> Use your DEC to buy/upgrade your GOLD cards. The gold cards earn bonus DEC (%5 per card per won battle), and so with the gold cards you don't actually LOSE/SPEND your DEC, but actually INVEST it into cards which will earn DEC into the perpetual future. You're welcome...