I remember hearing once that Dragon's Breath does not trigger when using Gamekeeper to put Darksteel Collossus in play. Gamekeeper has the same wording as Oath, and to the best of my rules knowledge, Dragon's Breath works with both cards. Does anyone know the reason for this confusion? Is there another similar card that doesn't work?
Parallax's memory is correct. If it's Gamekeeper is revealing Dragon's Breath and Darksteel Collosus, the Dragon's Breath won't trigger. Where Parallax is not correct is Gamekeeper having the same wording as Oath.
Oath of Druids
At the beginning of each player's upkeep, if that player controls fewer creatures than any of his or her opponents, the player may reveal cards from the top of his or her library until he or she reveals a creature card. The player puts that card into play and all other cards revealed this way into his or her graveyard.
Gamekeeper
When Gamekeeper is put into a graveyard from play, you may remove Gamekeeper from the game. If you do, reveal cards from the top of your library until you reveal a creature card. Put that card into play and put the other cards revealed this way into your graveyard.
The difference is extrememly minor, and seems like it would be completely irrelevant, but turns out to make a difference in this situation. Oath reads "...puts that card into play and all other cards ... graveyard." Gamekeeper reads "Put that card into play and
put the other cards ... graveyard."
With Oath it's a single action, so it's all done at once. 'Put A here and B there.' Since the aura is put in the GY at the same time as the creature in play, the aura can trigger. With Gamekeeper however, you have 2 seperate actions, '[1]Put A here and [2]put B there.' So you perform the actions in order. First you put the Collosus in play, then you put the aura(s) in the graveyard. So the aura's aren't in the graveyard until after the Collosus is already in play, too late for them to trigger