Agent of Silkia

{t}: Exile target creature with an ethereal counter
on it. Create a token copy of the exiled creature.
It's a spirit in addition to its other types.
At the beginning of your end step, if you control
a creature named Silkia, Fade Wanderer, you may
phase out any number of target permanents you control.
Being able to erase your own existence can be
especially useful.