There is a cool new feature on Peakmonsters at the moment. The option to lease cards from someone.
You click on market then click view cards on the card you want to lease.
Then click card rentals and you will see what people are offering.
For $0.02 per day a max level silvershield warrior can be rented. For $0.01 per day a level 8 silvershield warrior can be rented. As you can see there are many uncompetitive cards and with no way to filter it make sure you don't rent them. There is no point in renting a level 9 for more money per day than a level 10.