Wandering Shell-Walker

Whenever another Machine enter the battlefield
under your control, put a 1/1 counter on
Wandering Shell-Walker.

{1}{u}{r}: You may have
Wandering Shell-Walker become a Cauldron until
the end of turn, it loses all other abilities, and gain.
While Wandering Shell-Walker is a Cauldron,
all other Machine gain convoke.