Can Tactical Retreat save a unit from Cull the Weak if played before it resolves?
Player A plays Cull the Weak. Player B plays Tactical Retreat in response before units are chosen. Is the unit saved? Does this also work for Ruination?

Each player kills one of their units.
Artist: Kudos Productions
Card Set: Origins
Player A plays Cull the Weak. Player B plays Tactical Retreat in response before units are chosen. Is the unit saved? Does this also work for Ruination?
Ambessa's ability kills a unit. If she attacks a Poro and Baron, must she kill the Poro since Baron cannot be chosen? If only Baron is there with enough Might, does she kill him automatically?
If the only unit on my opponent's field is Ruin Runner, will they be forced to kill it when Cull the Weak resolves?
As a casual player, I find it confusing that spells like Cull the Weak and Unchecked Power can affect Baron Nashor. Thematically Baron feels like a big fight where those effects should not interact. Can board-wide removal like Cull the Weak hit Baron Nashor?
In a 1v1 game, when Cull the Weak says each other player chooses a unit, do I pick one of my opponent's units and they pick one of mine?