Number SevenExert Influence Exert Influence might not exactly qualify as mono-blue, but I think it does
If a face-up Fusion Monster(s) you control is destroyed by an opponent's card effect while this card is in your GY: You can place this card on the bottom of the Deck, and if you do, Special Summon 1 non-Fusion "Dragon Tale" monster from your GY
Detective Pikachu Japanese Promo #098/SV-P on eBay Meowth Phantasmal Flames Meowth gets a lovely laidback illustration in Phantasmal Flames
Company: Konami Brand: YuGiOh Item Type: Single Card Release Date: February 2009 Series: Machina Mayhem Structure Deck UPC: 0739761897245 Stock #: 205947 Our Guarantees to You, Our Valued Customer
This time, rather than being just a single mana, the charms required three mana of a specific shard (Grixis, Jund, Esper, Naya, and Bant)
Yes, the cards in this edition are not only highly valued by casual players but can also bring in huge profits due to their uniqueness and rarity