#5 Reality Acid Reality Acid is a rather simple card, and one whos competitive viability has certainly died down a bit given the rise in power creep in MTG
Dargo, the Shipwrecker Sacrificing more permanents lessens the impact commander tax has on Dargo, the Shipwrecker
Ursula, Deceiver of All boasts incredible artwork that's instantly recognizable as a unique form of one of Disney's very best villains, as well as a flashy effect that doubles the power of song cards
Myr are artifact creatures afterall, so Tempered Steel, Cyberdrive Awakener, and Cryptothrall work extremely well
To return to the Thalia example, this means that you can use the "Mina Harker" version even if all you have are the Historic Anthology or March of the Machine 's Multiverse Legends printings of Thalia, Guardian of Thraben
Vanellope von Schweetz - Sugar Rush Princess isn't a Legendary card, but it can still be highly useful in the right deck