Drown in Ichor

Two-mana -4/-4 is already a fine rate for black removal, wide enough to clear most early bodies and a good chunk of midrange threats without asking anything of the board. The proliferate rider is what makes this design worth talking about: it grafts an incidental counter-advancing effect onto a spell you were casting anyway for the kill. In a deck that cares about counters (poison and toxic, +1/+1 accumulation, planeswalker loyalty, charge counters on an artifact engine), the removal spell doubles as a free tick forward on whatever else you have in play, so the sorcery slot does two jobs for one card. The tension it resolves is a familiar one for counter-matters strategies: proliferate payoffs are strong but the enablers usually cost tempo, and stapling proliferate to efficient interaction lets you advance your synergy plan while still answering the board. Note the timing, though. This is sorcery-speed, so the proliferate resolves on your own turn rather than in response to anything, and the -4/-4 lasts only until end of turn; you are not holding it up as a combat trick. That constraint is the price for the tacked-on value, and it keeps the card honest as a proactive tool rather than a reactive one. Away from a counters shell the proliferate is dead text, and the removal stands or falls on the -4/-4 alone.