Tafad, Empty Soul

Partner with Xurid, Soulless Ancient
Echo {2}{u/b}{u/b}
When you pay Tafad's Echo cost, Tafad becomes
a copy of another creature you control except it's
not Legendary if that creature's Legendary and it
has Tafad's other abilities.
When this creature transforms for the first time
each turn, instead, it isn't a copy of the choosen creature. Then, transform Tafad into Tafad, The
Soul.