Magicians of Bonds and Unity (Quarter Century Secret Rare) (LEDE-EN000) - Legacy of Destruction 1st Edition Set_Power of the Duelist This card gains 300 ATK

This card gains 300 ATK for each Dragon-Type monster in your GY

Once while this card is face-up on the field

also it can activate the 2nd effect listed above as if it were "Therion "King" Regulus"

except "Atlantean Dragoons"

Magicians of Bonds and Unity (Quarter Century Secret Rare) (LEDE-EN000) - Legacy of Destruction 1st Edition Set_Power of the Duelist This card gains 300 ATKTypeSpellcaster Effect Monster AttributeLIGHT Level Rank8 ATK DEF2500 2500 Card TextCannot be Normal Summoned Set. Must be Special Summoned (from your hand) by having 25 or more cards in your GY. While your opponent has 25 or more cards in their GY, this card gains 2500 ATK DEF.