Hello people.
I know you know about the 2 quests with 1 rent method, but have you heard about the 3 quests with 1 rent method? No? Well you're in the right place then. Sit down relax and let me tell you how you can minimise your renting costs and maximise your gains.
Consider this a cyclical type of deal.
Day 1
The first day you only complete the given quest without renting. You do not open the chests.
Day 2
Here's where most of the work is done. This is the day you rent, lets say to Silver 3. Now you turn in your quest, and wait to see what is the next quest. If you can manage the new one without needing an additional rent for a summoner/card - do it as fast as possible.
After completing the quest, continue playing and draining your ECR. Up until 25 or 50% depending on you how want to proceed the following day.
Day 3
Complete the quest again, set an alarm not to miss it. What you can do this day depends on what you've done on day 2 with your ECR. To maximise your earning potential you don't want the ECR to reach 100% so you either just complete the quest and let your ECR recharge(if your ECR is around 50%) or you play some more to get it down to 30-25% ECR.
Mind you if you are going to play on the 3-rd day I'd start before the daily quest resets in order to have time to play in the higher league before your rent expires.
Bonus tip
This is what I call a "1 renting cycle" It requires a bit of planning and beeing punctual but there is definitely a benefit to doing 3 daily quests with 1 day rent.
After the 1st cycle you choose when you want to do your daily quest, while waiting for your ECR to recharge. The decision can be made on the second day.
Conclusion
This is how I've been doing my daily quest for the past few months and this has allowed me to purchase some extra cards with the same amount of time spent. Give it a try and let me know how you like it!
Good luck with your chest openings and until next time!