Best minion for long afk periods?

[12cpsgamer]

I had slime for a while, and I made the switch to sheep pretty recently. I heard that sheep got killed, so I'm not sure what to do with my setup. Is sheep still fine or should I switch to something else? I'm looking for something that I could leave for like at least a few months before coming back and my budget is probably around a few hundred mil or less.

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