Splitter, the Mimic Queen

Indestructible, Defender
{4}{t}: Splitter, the Mimic Queen becomes a copy of target artifact with this active.
Whenever a spell or artifact is copied, create
a 3/2 mimic token.
When Splitter enters the battlefield create X 3/2 mimic tokens with "{4}{t}: Mimic
becomes a copy of target artifact with this active."