Burden of the Lake

Enchant creature
Enchanted creature has first strike and vigilance.
If Enchanted creature is legendary, it also gets
+1/+1 and has indestructible.
"When I pulled the Caliburn from the stone, I knew
my life as a human was over. I am, instead, a King.
Now you give me an even greater burden with this
sword and scabbard... As King, I shall use it well.
I swear." - Artoria, King of Knights