Heroic Advance

Normal Trap

When a face-up "Heroic" monster you control is targeted for an attack: Target another face-up Level 4 or lower "Heroic" monster you control; double its ATK during this Battle Phase, then switch the attack target to it and conduct damage calculation, but monsters cannot be destroyed by this battle.

Rulings – Yugipedia

Printings:

Abyss Rising: ABYR-EN069 (Common) - 2012-11-09
OTS Tournament Pack 19 (POR): OP19-PT041 (Common) - 2022-06-15

Prices:

Cardmarket: 0.07 €
TCGplayer: $ 0.13