This week I also got a lot of Merits from reward chests and I just bought 10 Gladius cases for 20,000 MERITS from the guild shop.
And now I'm opening 10 Gladius cases in bulk, the Gladiator cards I got from the Gladius cases are as follows:
I got 3 Epic, 12 Rare and 35 Common (one is gold foil) gladiator cards from 10 Gladius cases, I didn't get any Legendary cards but I can honestly say that I'm very happy with the cards I got because I managed to level up some of my cards.