You get 1 treat from compendium match, 2 treats for stamping 1 and 5 teams of player cards. You get thing to get crab from stamping 8 teams, mammoth from International Fantasy Challenge and bird item from Main Event Predictions.
I did all my predictions before they closed, but didn't get a bird mount.
How to get it fixed?
You won't get the bird mount right away, you'll just get the Bird Lure item in your inventory, which you can then use to unlock the Smeevil style (but you must have already unlocked the Yellow Smeevil with a Smeevil Treat from Compendium Matchmaking first).