Forgotten Ghost Caller

When Forgotten Ghost Caller enters the battlefield, Support 2.
Whenever Forgotten Ghost Caller attacks, you
may choose another attacking creature that has a
+1/+1 counter on it. Remove a +1/+1 counter
from the chosen creature and put a +1/+1
counter on Forgotten Ghost Caller, then
Forgotten Ghost Caller becomes a copy of the
chosen creature until end of turn.