Blam! Plasmoid Mobster

Whenever a Devil enters the battlefield under
your control, put a +1/+1 counter on target Ooze
you control.
Whenever an Ooze enters the battlefield under
your control, put a +1/+1 counter on target Devil
you control.
Whenever an Artifact enters the battlefield under
your control, put a +1/+1 counter on target Devil
or Ooze you control.