Insane Inventor

Whenever Insane Artificer attacks, create a 1/1 colorless Servo artifact token, then flip a coin. If you lose the flip, Insane Inventor deals 3 damage to you.
Whenever Insane Artificer blocks, create a 1/1 colorless Servo artifact token, then flip a coin. If you lose the flip, Insane Inventor deals 3 damage to you.
{r}, Sacrifice X Servo tokens, Lose X life: Insane Inventor deals X damage to target creature or player.