Sword of the Stone

At the beginning of your upkeep roll a D20,
equipped creature gets:
•1-5: +1/+2
•6-10: +2/+3 and First Strike
•11-15: +3/+4, First Strike, and Vigilance
{bull}16-19: +4/+5, First Strike, Vigilance, and Indestructible
{bull}20: sacrifice the Sword of the Stone and create a legendary King Arther token and an Excalibur equipment token.