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It cares about the repartee ability word, which rewards you for targeting a creature with an instant or sorcery spell

This matches the deck size used in any game of Lorcana , making sure that you don't need to purchase any other cards

Note that the mana symbol is in the extort rules text, which means it doesn't count towards color identity, so you can play this in mono-black

In fact the printing of Unholy Heat (and to an extent Solitude) has mostly pushed out cards like Tarmogoyf out of the format, as the removal in the format is now so efficient that creatures either need to be one-mana, so you trade at an even level (Dragons Rage Channeler and Ragavan, Nimble Pilferer), too large to be killed by Unholy Heat (Deaths Shadow and Murktide Regent) or generate immediate value upon being played (Solitude, Fury and Omnath, Locus of Creation)

In fact, I would tend to prefer a 3-mana Walker that does this with a +1 over a 5-mana Walker that just draws a card and mills one (Jace, Memory Adept)