Twinetwig, the Roost of Souls

Whenever another nontoken, nonlegendary creature enters the battlefield under your control, if no mana was spent to cast it, you
may create a token that's a copy of it except
that it's 1/1, a white Bird, and has flying.
____________________________________
"We are all children of Mat'Selesnya. Call out
to the world, and the world will answer."