Hero Heart

Normal Spell

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.

Rulings – Yugipedia

Printings:

Shadow of Infinity: SOI-EN037 (Common) - 2006-02-18
Dark Revelation Volume 4: DR04-EN157 (Common) - 2007-11-14
Legendary Collection 2: The Duel Academy Years Mega Pack: LCGX-EN085 (Common) - 2011-10-04

Prices:

Cardmarket: 0.07 €
TCGplayer: $ 0.17