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Don't expect to get far in a Standard tournament with these

Olivia Voldaren Olivia Voldaren lets you convert your opponents' creatures into vampires and then steal them over the course of several turns

Some include a physical or vocal component, like Blacker Lotus or the Gotcha! mechanic on Touch and Go, some have rules that specifically reference flavor text or artists, like Carnivorous Death-Parrot and Drawn Together, and some require interacting with people or objects outside the game (Ashnod's Coupon being my favorite)

Alms Collector You may not have asked about this card, but we did want to bring it up because of the cards that did make the list

Without an immediate answer, it has a very high ratio of games that allow it to roll downhill before an opponent can stabilize