Caspar, Hotheaded General

Soulbound (You may pair this creature with another unpaired creature when either enters the battlefield.
They remain paired for as long as you control both of
them.)
As long as Caspar, Hotheaded General is paired
with another creature, each of those creatures has
"At the beginning of combat on your turn,
create a token that's a copy of this creature,
except it has haste and loses soulbound. Exile it at
end of combat."