Daein Nightwatch

Whenever 2 or more creatures enter the battlefield
on the same turn, you may search your library for
a creature with Squadron, reveal it, put it in your
hand, and shuffle your library. Tokens created
with this creature's Squadron ability do not have
this ability.
Squadron (whenever another creature with squadron enters the battlefield you control, create
a token that's a copy of this creature except that
it doesn't have Squadron.)