Can you cull the weak a ruin runner?

Question

Accepted Answer

Yes, you can play **Cull the Weak** even if your opponent controls a **Ruin Runner**.

Here is the breakdown of why this interaction works:

*   **Cull the Weak does not target:** **Cull the Weak** does not target or choose any units when it is played. The instruction to kill a unit is performed by each player during the resolution of the spell.
*   **Ruin Runner's protection:** **Ruin Runner** has the ability: "I can't be chosen by enemy spells and abilities." Because **Cull the Weak** does not "choose" or "target" units, it does not violate the protection ability of the **Ruin Runner**.
*   **Resolution:** When **Cull the Weak** resolves, each player must kill one of their own units. If your opponent has a **Ruin Runner** and no other units, they will be forced to choose the **Ruin Runner** to satisfy the spell's effect, as the spell's effect is mandatory and does not rely on targeting.