Quote Originally Posted by Finn View Post
My thoughts exactly. We have never had this ability before in a single card.

Kiki maybe for starters.
Helm of the Host does something similar. And, as a practical matter, Sakashima the Imposter doesn't "remove legendary" but does allow you to copy legendary creatures so you could already use that to have two copies of Eladamri, Lord of Leaves or whatever in play. There's also stuff like Necrotic Ooze that copies abilities.

So I'm not sure there are that many avenues for novel exploits.