The cost reduction based on your allies is pretty incredible considering you only need a couple to make favorites like Swiftfoot Boots, Sword of the Animist, and Brotherhood Regalia cost
Ruby/Amethyst might feel too simple for advanced players, and Steel/Emerald could feel confusing for beginners.
Once per turn, if a monster(s) is sent to your opponent's GY: Inflict 1000 damage to your opponent
Dragon" and destroy "Red-Eyes Darkness Dragon" to win the Duel
In rakdos specifically, cards with sacrifice synergies, like Mayhem Devil and Mahadi, Emporium Master, can save you from having to clear out your own creatures while making use of creative ways to create Treasure tokens
This promo version of the card features the same art as the set version but now in foil and with the Wizards of the Coast star at the bottom