Queen Ruby

Artifacts you control cost {1} less to cast.
When Queen Ruby enters the battlefield, you become the monarch.
At the beginning of each player's upkeep, if your the monarch, create a 1/1 colorless Servo artifact creature token with "Overheat — {2}: This creature gets +1/+1 until end of turn. If this is the third time this ability has resolved this turn, sacrifice this creature at the end of turn."