Fafnir of the Permian Basin

Menace
Fafnir of the Permian Basin gets +1/+0 for each
other shapechanger, horror, and transformed
creature you control.
Whenever a shapechanger or horror creature
enters the battlefield under your control or a
creature you control transforms, Fafnir of the
Permian Basin gains indestructible and trample
until end of turn.