As long as Magmar is an Evolved Pokémon, all Energy attached to Magmar are Energy instead of their usual types.

Choose 1 of your opponent's Pokémon. This attack does 10 damage to that Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)

If the Defending Pokémon already has any damage counters on it, the Defending Pokémon is now Burned.