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Cards like Shambling Vent were all-stars back in the day in Standard

shaving a mana from it with The Ur-Dragons eminence makes it quite powerful when it comes to casting discounted Dragons from the top of your library

Also, a shout out to Griselbrand that costs eight for a 7/7 flyer with lifelink that can swap 7 life for 7 cards and was so broken in older formats like Legacy that reanimated him, or cast him with no additional costs that he was really a one-dork format for much of its run and answers like Liliana of the Veil rose to the top

(I used it once before many years ago in a column during Soldier Week.) Also, was the trivia to easy, too hard or just right

X is equal to the Cat's existing power - that sudden doubling can be very handy