Shadowverse

You take the maximum buff for the stegodon and win.

The dinosaur build also works well (I just finished an arena run). One loss was against a paladin with an even better opening hand and overpowered cards than mine, and the other two were against rogues who outpace you in tempo and counter your buffs with sap/assassin/flower.



In general, Blizzard tried and tried to balance the arena, and then they gave the paladin the stegodon and dinosize, the mage meteor and petroglyph, the rogue poisoned weapon, and everything went back to square one. But personally, I still find it interesting to play, maybe because I haven't played much on the Ungoro arena yet.
By the way, has anyone tried the hunter? I never liked him in the arena because I couldn't build a decent aggressive deck (and the hunter doesn't really play any other way). But now, some people say he's almost as good as the rogue.