Nightblood

Equipped Creature must attack each combat and has Deathtouch, Infect, and {p/b}{p/b}{p/b}{p/b}:Invest
When equipped creature deals combat damage to a player, that player looses the game.
At the beginning of your end step, remove an invest counter from equipped creature if you can't sacrifice it.
Equip Remove 3 Invest counters from creatures you control