Legendary Vampiristic Sword

Put card over target creature(or Planeswalker). Creature gets +5/+3, Deathtouch, flying, double strike, reach, and lifelink.
Every creature this creature Kills also brings this creature back to full
life.
"Use of the sword not only changes the mind and abilities, but also the body itself. Good men will take it,
and within days, they will have sprouted wings and become tyrants. Utterly terrifying"
-Ranco Cionc, famous biology expert.