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The ceiling though

Many energy-generating permanents do so when they enter the battlefield, and the built-in Panharmonicon of Yarok, the Desecrated gasses up our energy machine to new levels of productivity

Before this change, Wizard Mentor was a first pick card which could save your creatures from creature kill spells, allow you to reuse the bevy of 187 creatures in the format (Ghitu Slinger, anyone?), and at worst case scenario allow you to play emergency defense

Most of them cost just a few dollars or less and highlight what black does best: efficient creature removal, recursion from the graveyard, sacrifice payoffs that turn losses into value, and life drain effects that slowly wear down opponents