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1BCreature Human Spy Villain When this creature enters, it connives

Similar to Walking Ballista, Marketback Walker enters with counters equal to half the mana you pour into it and can gain additional counters for four mana

With every change to the game they also go back through the entire history of cards and update the rules text for consistency

Black Lotus ($14,000+) Most people reading this list probably knew which card tops it

negate that effect, then if you Tributed a Rank/Link 2 monster to activate this effect, you can destroy that monster

For only one more mana than Remove Soul, you outright countered any creature your opponent cast, plus got to draw a card