yugioh wiki yugi deck Yu-Gi-Oh! Starter (2002) Complete Set Yugi Muto | Yu-Gi-Oh! Wiki

That'd require at least 5 energy to start, plus a boost energy

You must activate the ability in order to exile Chandra and return her to the battlefield transformed, even if Chandra has already dealt 3 or more damage during the turn

Finally, theres the card effect itself

3 anime-original cards

Baneful Boom is an attack that costs a whopping 5 Energy, including 2 Water, 2 Lightning, and 1 Colorless, and forces it to discard all Energy attached to it, but instantly Knocks Out the opposing Active Pokmon

It doesn't matter if that player is also attacking any planeswalkers those opponents control or battles they protect