Today, we’ve added a tabard to Wrath Classic for Deadly Gladiators. This will be only purchasable during Arena Season 5 (the now current season).
You’ll find it on all three of the expected vendors: Nargle Lashcord (Dalaran), Kezzik the Striker (Area 52), and Argex Irongut (Gadgetzan). It costs 550 Arena Points and requires an Arena Rating of 2300 in any Arena team-size bracket.
Good luck becoming deadly, gladiators!