Byghli, Illixian Champion

When Byghli, Illixian Champion enters the battlefield, create 12 gemstone tokens with “if Byghli, Illixian Champion would be killed, exiled, or otherwise removed from the battlefield, you may sacrifice this and take an amount of damage equal to the amount of these gemstone tokens in your graveyard”
Byghli’s power is equal to the number of gemstone tokens in your graveyard