I did not own an Efreet before this so I took the opportunity to rent a cheap one for two days to test it out. Actually, I don't own and have not used anything with last stand before. So this was totally new.
I came upon what seemed like an appropriate fight with no summoner abilities and a low mana limit (14)
I approached it by trying to have some survival with Cerberus to start taking out whatever they had and figured at the end hopefully the Efreet would outlast anything left. I assumed that if the opponent set up to attack the Efreet on my backline the Cerberus may be enough by itself, so either one could carry me to victory.
Honestly, it was all a little anti-climactic since I think my opponent messed up their lineup big time. No clue why someone would put spark pixies in the first spot with nothing attacking from range. I'm pretty certain I still would have won if they switched the pixies to the back, but it would have been much closer.