Advanced format ruling
Hero Heart
Card effect (current official text)Target 1 face-up "Elemental HERO" monster you control; halve its ATK until the end of this turn, but it can attack twice during this turn's Battle Phase.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.