guess that mob from MINECRAFT

i'm taller than a player. i the only mob that can pick up blocks. when you look in my eyes or hit me. i will attack you. what mob am i?

i live in the Nether. i'm bigger than a player. when i see you. i will attack you. what mob am i?

i have 3 heads. i have a black tail. and i shoot out small heads what mob am i?

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