Gregory, Arcane Cannoneer

Whenever you cast an artifact spell, if you
don't control a creature named Junior's Cannon, create Junior's Cannon, a legendary 2/2 red and
blue artifact cannon token with "Whenever you
cast an artifact spell, each opponent loses one life
and you may scry 1."
{1}{w/u}:Gregory, Arcane Cannoneer and target
Cannon token gain +1/+1 and trample this turn.