I have both maxxed and I think that Leons mana cut of 40% could be a very strong weapon, specially if you are facing an opponent with slow or average mana heroes. Just think about having killed three heroes already and Alby or MN are bringing them back, with a 40% mana cut you have 3-4 moves more to clean the table.
For diversity, I also vote Leonidas…on a defense I underrated a lvl 10…Emblem Leo once and the battle went south, with lvl 23 mana troop you will be amazed at his performance on offense,
Also Leo is my first 5* in the game, just getting the 4th tier a few days ago after sitting at 3/70 for a very long time.
In terms of relevance, I’m hoping costume would give him attack 3 instead of just 1 currently.