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Zellix, Sanity Flayer This legendary horror turns your opponents mill into value on your board

You can use 4-5 colors if you want, but it requires a very carefully curated manabase

Forest Gaelicat Gigantoad Gohn, Town of Ruin Gongaga, Reactor Town Goobbue Gardener Gran Pulse Ochu Guadosalam, Farplane Gateway Gysahl Greens Haste Magic Hecteyes Hill Gigas Ice Flan Ice Magic Insomnia, Crown City Instant Ramen Iron Giant Island Item Shopkeep Laughing Mad Light of Judgment Loporrit Scout Lunatic Pandora Magic Damper Magic Pot Magitek Infantry Malboro Monk's Fist Mountain Mysidian Elder Namazu Trader Paladin's Arms Plains Prishe's Wanderings Qiqirn Merchant Qutrub Forayer Rabanastre, Royal City Red Mage's Rapier Resentful Revelation Retrieve the Esper Rook Turret Sabotender Sage's Nouliths Sahagin Scorpion Sentinel Sephiroth's Intervention Sharlayan, Nation of Scholars

The same is true while it's on the battlefield with its front face up