Gonta, Founder's Familiar

Reach, Trample, Vigilance
When Gonta, Founder's Familiar enters the
battlefield, create a 1/1 white Spirit creature
token with flying and indestructible named Alf,
King of the Ancients.
Whenever Gonta, Founder's Familiar leaves
the battlefield, you may sacrifice Alf, King of
the Ancients. If you do, destroy all creatures.