Godfrey, the First Elden Lord

When Godfrey, the First Elden Lord enters
the battlefield, create Beast Regent Serosh,
a legendary 3/3 green Lion creature token.
Godfrey can only attack if you control a
creature token named Beast Regent Serosh.
{3}{r/w}, Sacrifice Beast Regent Serosh:
Transform Godfrey, the First Elden Lord.
"Alas, I am returned"