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Its even restricted in Vintage too

Irenicus's Vile Duplication works best with decks that care about instants and sorceries and/or ones that have a commander that benefits from evasion, like Kalamax, the Stormsire

What does Rograkh, Son of Rohgahh do

There are 17 Time Lord Doctors to choose from in many color combinations, except for black

Even if its more likely to be a source of bonus value or side benefit than the main defining pillar of a deck, providing another source of pressure or combat potential at such low deckbuilding cost especially one thats unpredictable to opponents makes it an excellent bonus to look for