DCI Certified Judge & Goth/Industrial/EBM/Indie/Alternative/80's-Wave DJDJ VortexDCI Certified Judge since July 13, 2013
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614.4. Replacement effects must exist before the appropriate event occurs—they can’t “go back in time” and change something that’s already happened. Spells or abilities that generate these effects are often cast or activated in response to whatever would produce the event and thus resolve before that event would occur.
Sean Stackhouse Level Two Judge (Yay!) Maine
a persisting Melira, Sylvok Outcast will get a -1/-1 counter, while a persisting Melira's Keeper will not
I belive this one is required for completedness:
112.6h An object’s ability that states counters can’t be placed on that object functions as that object is entering the battlefield in addition to functioning while that object is on the battlefield....because neither Meliras fit the criteria described in 614.1c-d.
the Meliras modify the persist replacement effect, so it applies
I believe it was determined that persist isn't a replacement effect because it doesn't match any of the wordings of 614.1