Gwyn, Lord of Cinder

Vigilance

When a legendary creature you control dies you may search your library for a historic card and put it in your hand, then shuffle your library. (Artifacts, legendaries, and Sagas are historic.)

When Gwyn, Lord of Cinder dies, create a tapped Soul of Gwyn, a legendary artifact token with "{t}, Sacrifice this artifact: put a historic permanent from your hand onto the battlefield.".