Nightblood

When you gain control of Nightblood, sacrifice
X untapped lands. Nightblood is X/X.
If X is 0, Nightblood is 1/1.
At the beginning of your upkeep, you lose 5 life.
At the end of your turn, if you control
Nightblood, but do not own it, you lose the game.
{w}{u}{b}{r}{g}: Nightblood gains Indestructable.
{7}: Target player gains control of Nightblood
until the end of their turn. Any player can
activate this ability at any time.