She will enter the battlefield with a -1/-1 counter.
When a permanent is entering the battlefield, you process replacement effects affecting this event before it actually happens.
You take into account:
- replacement effects from objects already on the battlefield,
- replacement effects from the object entering the battlefield that affect itself specifically.
You do not take into account replacement effects created by the object entering the battlefield that affect a group of objects, even if the object itself happens to be in a group.
Melira affects a group, so she doesn't affect her own entering the battlefield.
Tatterkite affects itself specifically, so it affects its own entering the battlefield and will enter with no counters.
Daniel Kitachewsky
L3, Paris, France
Rules NetRep