A little confusing since the forced space between the Traits and the effect

Heres the full effect

Cost is reduced by the number of sacrificed units this turn. When a unit is sacrificed, deal 1 [damage] [pure] to all other units in the same horizontal row as Mar-Xim. If you end your turn and you have not paid 1 Chaos, Mar-Xin will sacrifice a random unit you control.

*Arch Daemon - If another Arch Daemon would enter the board, Destroy this card before it does.