Dionisio Giovanna

Changeling (this card is every creature type.)
Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under
it's owner's control with a +1/+1 counter on it.).
When Dionisio Giovanna enters the battlefield,
choose a creature type. Dionisio Giovanna
get's +X/+X where X is the number creatures of
the chosen type you control.
As long as Dionisio Giovanna is equipped it
has Double Strike.