I've been trying out the rental market to test my luck and see if I can turn a profit somewhat passively with the Archmage token. Overall I'm pretty happy with my rewards this season and I reached Diamond league again.
I will admit I didn't track everything that well but with the new season here I will be tracking my DEC spent, what rentals I get and my earnings. Archmage currently takes 35% of my SPS reward but it doesn't touch any other rewards so I have to take that into account in the future.