Regis, Animist Prime

Artifacts and lands you control with +1/+1
counters on them are Construct creatures in
addition to their other types. If they don't
already have a base power and toughness, their
base power and toughness are 0/0.
{g}{w}, Sacrifice an artifact or land: Put a +1/+1
counter on target artifact or land. Then if that
permanent has five or more +1/+1 counters on
it, you may have it fight target creature.