Bazaar Tragemage has overperformed for me. In fact, I've never felt I needed any discard synergies for it to be a beating.
My cube has smaller creatures and a 3/4 Flyer is positively big. It's a huge blocker and it won't have any rivals on the sky. It has a very large board presence for its price.
Losing one card is misleading. It doesn't say discard a card, like Bloodrage Brawler, it says draw two and then discard three. It's closer to a stapled Faithless Looting or Frantic Search than it is to a mere discard. Most of the time, I've felt it has given me a boost in card quality at the cost of losing a meaningless land, a spell I wasn't interested in or a card that likes to be in the graveyard.
Of course, my cube does tend to have graveyard synergies. But look, if you can spare a land, it's a 2U 3/4 Flying that filters two. And if you already have three mana, chances are you can spare that land to keep the beatdown going. It has been very generically strong to me.