You have a way to cause Nine Lives to leave the battlefield.
({3} magic symbol) ({U} magic symbol) available.
Steps
Cast Donate by paying ({2} magic symbol) ({U} magic symbol) , giving an opponent control of Nine Lives.
If needed, activate Shadowspear by paying ({1} magic symbol) , causing all permanents your opponents control to lose hexproof and indestructible until end of turn.
Cause Nine Lives to leave the battlefield.
Nine Lives triggers, causing its controller to lose the game.