Hi. I've been building my mutate edh deck and I'm trying to figure out all the rulings and interactions whit mutate. And this one I'm not realy sure. If I have Lazav, Dimir Mastermind on top of a pile of mutates and he becomes copy of some creature that died. Lazav becomes copy of the creature that died, does it still have the abilities of the mutated cards below him?
No. The abilities granted by the cards below Lazav in the pile are granted in layer 1, the same layer as copy effects, and the effect of the pile becoming a copy of something else has a later timestamp, and so it overlays all the text including those abilities. Lazav keeps hexproof and his copy ability, as the ability states he does, but he loses all the other rules text. Now, if you mutate something under him after he's copied something, then he has the abilities of the mutate card. Again, timestamp.
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I'm a former judge (lapsed), who keeps up to date on rules and policy. Keep in mind that judges' answers aren't necessarily more valid than those of people who aren't judges; what matters is we can quote the rules to back up our answers. When in doubt, ask for such quotes.
Thanks for the help