system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] How was the time stone in Agamotto's hands in the first place?
gpt
We see at the end of GotG2 that there is at least one alien who uses the same magic as Doctor Strange. Presumably, Agamatto used his sling ring to travel to different planets and teach magic to various different species and societies. After all, three Sanctums on Earth hardly seem like they'd be able to protect the whole universe by themselves; they're probably just vital parts of a larger network of Sanctums spanning the universe. Agamotto probably found the Time Stone during these travels.