This is why you don't see a card such as "CARDNAME gets a +1/+1 counter whenever it deals damage to another creature." As with most of the above, there are exceptions to this
An XRR spell is a long way from mana efficient, it never really gets to being efficient either, even when it does double damage

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Switch 1 of your opponents Benched Pokmon with their Active Pokmon
If you pay enough energy, you effectively get to hold on to the cards that were in your hand