Leyline of the Swamps

Black spells and nonmana abilities of black permanents have Assist (Another player can
pay any amount of the spell’s or ability's
generic mana cost).

Whenever a player pays for a spell or ability
they don’t control, that player may gain 2 life and have target player lose 2 life. If they do, exile all other abilities of Leylines.

It seems that, as the machines encroach, the spirits have fewer and fewer places to haunt.