Wayward Sapper

Haste
Defect 3 (This creature enters the battlefield with
three vow counters on it. At the beginning of your
upkeep, remove a vow counter from it. When the
last is removed, target opponent gains control of it.)
Wayward Sapper attacks each combat if able.
Whenever Wayward Sapper is dealt damage, sacrifice it and it deals 4 damage to you.