Typhoon Trigger

Enchant target creature with a Hammer
equipped.
Enchanted creature gains +2/0, "At the
beginning of each upkeep put a Swing Counter
on enchanted creature." and "Whenever this
creature attacks you may remove x Swing
Counters from this creature if you this creature
gains +x/0 until the end of the turn."
If enchanted creature doesn't have a Hammer
equipped sacrifice Typhoon Trigger