While this card really only belongs in a sliver deck, it deserves its spot on this list by being a useful card for an already powerful creature type
New, unopened
Not via harmonize itself tapping a creature as part of the harmonize cost only reduces the generic mana, not the colored mana
This premium collection includes a Japanese promo card featuring Charizard, along with a beautifully illustrated card file (binder) designed to showcase your cards in style

Masters of Evil Cards Added View on Archidekt Artifacts (6) 1 Izzet SignetIzzet Signet 1 Lithoform EngineLithoform Engine 1 Mystic ForgeMystic Forge 1 Oni-Cult AnvilOni-Cult Anvil 1 Relic of SauronRelic of Sauron 1 Talisman of CreativityTalisman of Creativity Creatures (10) 1 Brudiclad, Telchor EngineerBrudiclad, Telchor Engineer 1 Enthusiastic MechanautEnthusiastic Mechanaut 1 Etherium SculptorEtherium Sculptor 1 Karn, Legacy ReforgedKarn, Legacy Reforged 1 Kuldotha ForgemasterKuldotha Forgemaster 1 Master TransmuterMaster Transmuter 1 Padeem, Consul of InnovationPadeem, Consul of Innovation 1 Scrap TrawlerScrap Trawler 1 Silas Renn, Seeker AdeptSilas Renn, Seeker Adept 1 Workshop EldersWorkshop Elders Planeswalkers (1) 1 Tezzeret, Master of the BridgeTezzeret, Master of the Bridge Parting of the Ways Removing cards from a deck is always hard, especially from decks in this series as they're so synergistic and have meaning and a story within the deck itself