Dread Warlock

Evasion that checks the blocker's color rather than relying on a keyword: this 2/2 slips past everything except the one color most likely to be sitting across the table from it in a mirror. That conditional is what prices the body. Against white, blue, red, or green, it is a genuinely unblockable attacker for three mana; against another black deck, it is a vanilla creature that trades into chump blockers like anything else. The design folds the evasion's reliability into a metagame bet rather than a fixed cost, which is a quieter, older way to balance an unblockable attacker than the usual route of shrinking the body or raising the price. The structural cousin is the protection-from-a-color line of design, where a single color is carved out as the exception: same idea, inverted, since this carves out one color as the only thing that can block rather than the only thing that can't. The flavor tracks the math cleanly: a warlock dressed in dread who walks through anyone not already steeped in the same darkness. It reads as a small creature with an asterisk, but the asterisk is doing all the work, and how much work depends entirely on which colors share the table.