Amalgam of Destruction

[item=152963] is a reward from the pet collecting achievement coming in 7.3:

Raiding with Leashes V: Cuteaclysm

The pets drop from Cataclysm raids:

[zone=5334]
•[npc=127857] from [npc=45992] or [npc=45993]
•[npc=127858] from [npc=43735]
•[npc=127859] from [npc=43324]

[zone=5638]
•[npc=127863] from [npc=45870], [npc=45871], or [npc=45872]
•[npc=127862] from [npc=46753]

[zone=5094]
•[npc=127850] from [npc=42166], [npc=42179], [npc=42178], [npc=42180]
•[npc=127853] from [npc=41376]
•[npc=127852] from [npc=41378]

[zone=5723]
•[npc=127947] from [npc=53691]
•[npc=127950] from [npc=53495]
•[npc=127948] from [npc=52498]
•[npc=127951] from [npc=52571]

[zone=5892]
•[npc=127952] from [npc=55312]
•[npc=127953] from Spine of [npc=53879]
•[npc=127954] from Madness of [npc=56173]