Cast Altered Ego by paying ({7} magic symbol) ({G} magic symbol) ({U} magic symbol) , causing it to enter the battlefield as a copy of Sage of Hours with five +1/+1 counters on it.
Activate Altered Ego by removing all +1/+1 counters from it, causing you to take an extra turn after this one.
Activate Temur Sabertooth by paying ({1} magic symbol) ({G} magic symbol) , returning Altered Ego to your hand from the battlefield.