Whirligig Saw

Trick Weapon (This card enters the battlefield with
one of its abilities of your choice. When equipped to a
creature, you may pay {2} at any time to switch the
active ability.)
• Equipped creature gets +1/+1 and deals damage
equal to half its power to all creatures that block
it before the damage step. (Round down.)
• Equipped creature gets +3/+0 and can't be
blocked.
Equip {4}