cull of the weak

Cull the Weak — Order spell, 2 energy + 1 Order power. Text: "Each player kills one of their units."

Key rulings: it does not target or choose anything when played (Core Rules 355.10.e — "each player kills a unit they control" is chosen at resolution, not on the chain). Each player, including you, picks their own unit during resolution.

Consequences: it can't be countered by Not So Fast (which needs a spell that chooses a friendly unit or gear), it gets around "can't be chosen by enemy spells and abilities" like Ruin Runner (your opponent still must kill it if it's their only unit), and you can play it with no units of your own — you just ignore your half of the instruction (do as much as you can, Rule 356.3.e.11).

Note the official card name is "Cull the Weak" — if you were asking about something else with that name, tell me and I'll re-check.