Dakmor Lancer

Pay six mana and you get a 3/3 that kills something on the way in: a creature-removal package stapled to a body at a deliberately steep price. The restriction that pays for the destruction is the color line. The kill clause cannot touch a black creature, which means the card has a real blind spot against mirror-aligned threats and offers no removal against a board of black creatures; against everything else, it offers unconditional destruction with no toughness clause and no mana-value cap. The body itself is incidental, a 3/3 that exists mostly to justify the enters trigger rather than to stand as a wall. This is the creature-as-removal template black has returned to repeatedly, trading the efficiency of a dedicated spell for the resilience of a permanent that can chump or attack once the kill is spent. The six-mana price tag is the honest accounting: a kill spell with the body's tax folded in, recastable off any recursion that wants to re-trigger the enters effect. Note the seam in the wording, though; since it destroys, an opponent's indestructible creature shrugs the trigger off entirely, which is the one thing the color line does not protect you from. What it is built for is the grindy black deck that wants its removal to leave a body behind, where eating a blocker and presenting a threat in the same card is worth paying retail.