Gaia the Magical Knight of Dragons (MP21-EN124) - 2021 Tin of Ancient Battles 1st Edition

1 "Gaia the Fierce Knight" monster + 1 Level 5 Dragon monster
This card's name becomes "Gaia the Dragon Champion" while on the field. You can only use each of the following effects of "Gaia the Magical Knight of Dragons" once per turn. During the Main Phase (Quick Effect): You can target 1 other card on the field; this card loses exactly 2600 ATK, and if it does, destroy that card. When this card destroys an opponent's monster by battle: You can make this card gain 2600 ATK.