Galaxy Knight (Purple) [LDS2-EN049] Ultra Rare

If you control a "Photon" or "Galaxy" monster, you can Normal Summon this card without Tributing. If Summoned this way: Target 1 "Galaxy-Eyes Photon Dragon" in your GY (if possible); regardless, this card loses 1000 ATK, and if it does, Special Summon that target (if any) in Defense Position. This ATK decrease lasts until the end of this turn.