AGM is impossible to get unless get babyseat since the end of wotlk. I manage to get 2 without help before achievements became end-game content. Then it was pretty much impossible. I tried 3, 6, 9, 12, 15 on low populated servers: minimum 2 max lvl toon eveytime. On top of that you usually meet there a sucky arena player under 2k mmr camping gurubashi because he usually overgear other 85s. Atm they are mage / warriors ofc. You can /wisp them and bribe them to get the agm, but it will cost you a lot of gold. Still it's the best way and only to get your trinket.
One solution could be to put a lvl limit (should be around 40+) to AGM. I honestly felt like cheating everytime I poped shield. This toon is now 80, but I still think agm = cheap way to win as a twink. Now if you play fotm twinks (hunters / pal / priest) on top of that......^^.
But I see you play a warrior, so gz to you for not being a sheep and GL for your trinket =)