Kaheera, the Orphanguard This is probably the card that I'm most excited to build around

Academy Manufactor Ant-Man's Army Apothecary White Astrid Peth Bag End Banquet Bake into a Pie Bakersbane Duo Banquet Guests Bartered Cow Bilbo, Fellow Conspirator Bill the Pony Bog Naughty Bonecache Overseer Bosco, Just a Bear Brandywine Farmer Brenard, Ginger Sculptor Bristlebud Farmer Bumbleflower's Sharepot Bumi's Feast Lecture Bushy Bodyguard Butterbur, Bree Innkeeper Cache Grab Camellia, the Seedmiser Campsite Cuisine Canyon Crawler Cat Collector Cauldron Familiar Cirith Ungol Patrol City Pigeon Common Black Removal (playtest) Concession Stand Concession Stand Concession Stand Concession Stand Corpseberry Cultivator Courier of Comestibles Creeping Crystal Coating Crumb and Get It Curious Forager Curious Pair Curious Pair Devouring Sugarmaw Devouring Sugarmaw Eager Trufflesnout Eastfarthing Farmer Elanor Gardner Elephant-Mandrill Experimental Confectioner Fae Offering Farmer Cotton Fat Ass Feasting Hobbit Feasting Troll King Featherbrained Filcher Feed the Cauldron Feed the Cycle Fell the Pheasant Field-Tested Frying Pan Fierce Witchstalker Food Coma Food Fight Foreboding Fruit Fortifying Provisions Galadriel, Gift-Giver Generous Ent Giant Mana Cake Giant Opportunity Giant's Skewer Gift Shop Gift Shop Gilded Goose Gingerbread Cabin

You essentially have to destroy a bunch of cards to collect enough currency to trade one, making the system only viable to whales who have no use for trading, and unusable for free-to-play or new folk who would benefit from filling out their collections
The third ability is the one that will make you bolt upright
Getting it in your yard may be a bit of an issue in white, but its not impossible
This could potentially wipe the board and give you an advantage in spite of its high mana cost