Is there any way to get the last 10 Tatiana/Killer queen tokens to rank her up to rare tier without..

Is there any way to get the last 10 Tatiana/Killer queen tokens to rank her up to rare tier without spending 50 pounds? All I want is her to be at the blue rare tier but I really feel that spending 50 pounds just to get the last 10 tokens is a bit of a rip off and was hoping there was another way. Thanks