Eris, Soul-Bound Forge

At your upkeep, Eris deals X damage to you, where
X is the difference between the amount of
artifacts you control and Eris' toughness.

{8}, {t}: Create a 0/0 red and white Construct
artifact creature token with “This token gets +1/+1
for each nontoken artifact you control.” This
ability cost X less, where X is the amount of
nontoken artifacts you control.