Veja, Mirror Manipulist

Partner with Zipf, Squirrel Savant
{u}{b},{t}:Put a token onto the battlefield that's a
copy of a permanent you control. If it's a
creature it gains haste. It isn't legendary if that
permanent is legendary. Sacrifice it at the
beginning of the next end step.
She wandered the Halls of Reflection, lost
and alone, for years. If not for Zipf, she might
never have left.