Just to make sure that youre reading this correctly, this is no combat trick
Each colour is associated with a strategy: Steel hits hard, Sapphire is slow and strategic, Ruby hits fast but weak, Emerald is about thinking beyond the playing field, Amythest nerfs your opponent and Amber heals and buffs your deck
Once activated, it changes the rules of the duel so that each player can only attack with one monster each turn, and whoever manages to inflict damage to their opponent twice in a row without taking damage themselves instantly wins the duel
When you Ritual Summon a Wyrm-Type monster you can banish this card from your GY as tribute as a Level 7 monster." "Can only be Ritual Summoned by the effect of "Mark of Atan" and cannot be summoned other ways
The card was legal as a four-of all the way up to April of 1995, when Standard was first invented