On Hondoom GE you can use multi energy to use both effects of it's attack. Doing the +30 and the burn. That's because multi energy provides both the energy to use those effects. Latias doesn't say energy cards so where you have to discard two different cards. Multi provides water energy and when it is discarded it fulfils the water requirment, multi also provides the fire so when it is discarded shouldn't fulfil that requirement?