They're trash cards on their own and I have yet to see anyone else play with them, but they have an interesting interaction with one card in particular that is heavily played in Commander: Nearly every Commander deck that runs black will run Urborg, Tomb of Yawgmoth, either for mana fixing and/or for its synergy with Cabal Coffers
Wormadam was one of the few uncommon cards that were banned, however, because it was "too powerful for its rarity." 7 Tropical Beach It's pretty common to see cards banned for being too powerful, and in other cases, it's common for cards to be banned due to misprints or vague abilities
Sauron, the Dark Lord
And, of course, if you do manage to turn on Corrupted, it turns into a three mana Gilded Lotus
Those three colors can be represented in the mana cost of the card or might have colored pips in their rules text that add to their color identity
Unlike the other cards mentioned it is a one-time effect, and it is conditional on being on the losing end of a major combat or board wipe, but its also card draw in Black that doesnt cost any life in order to obtain them