I give myself 5 bucks.
I give myself 5 bucks.
I have given myself 10 bucks.
I give myself 20 energy.
I give myself 20 energy.
I have given myself 40 energy.
The wording should then be: "Select a target. You gain 20 Energy and the target gains 20 Energy."
Instead of: "Select a target. Both you and the target gain 20 Energy."
By a logical point of view, in the first case you are applying action A to subject X and then applying action A to subject X, resulting in applying the action twice on the same target, while in the second case you are applying action A to subjects (X and X), which means you are applying the action once to the set T := {X, X} = {X}, resulting in one action applied once.