Possible leak from a trusted source. Trust with caution.
Elemental HERO Core
2? “Elemental HERO” monsters
Cannot be Special Summoned except by Fusion Summon.
1) A once per turn effect that lets you double its ATK if it’s targeted for an attack
2) An effect that destroys monster(s) on the field at the end of a Battle Phase it attacked
3) An effect that, when it’s destroyed by a card effect, lets it revive a Fusion Elemental HERO