Leyline of the Plains

White spells and nonmana abilities of white 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 create a
1/1 White Soldier creature token. If they do, exile all other abilities of Leylines.

"The machines inherited a splintering reality from the
humans..."