Golden Rule (BLMR-EN035) - Battles of Legend: Monstrous Revenge 1st Edition

(This card is always treated as a "Crystal" card.)
Place 2 "Crystal Beast" monsters from your Deck face-up in your Spell & Trap Zone as Continuous Spells, then Special Summon 1 "Crystal Beast" monster from your hand or GY with a different name than those cards, and if you do, equip it with this card. When this card leaves the field, destroy that monster. You can only activate 1 "Golden Rule" per turn.