Magma Vein

Pyroclasm rendered as a faucet instead of a flood. Where the classic sweeper hits everything at once for a flat cost, this charges you a land and a red mana per activation and only clears one toughness at a time. That fuel cost is the leash: every ping eats a permanent off your own board, so you are trading mana base for board presence, and the math turns ugly fast against anything bigger than a token. What it buys in return is a repeatable, on-demand sweep that lives as a permanent threat, an answer you draw into play once and reuse, not a card you spend and lose. A control deck holding it forces an opponent to commit creatures into a recurring 1-damage wrath that never goes away and that they cannot answer with a counterspell after it resolves. The exemption for flyers is the design's pressure valve, keeping it from being a clean answer to everything and pointing it squarely at the ground-creature swarms it was meant to police. Self-sacrifice as the ongoing cost makes it a slow engine that wants a board it can afford to feed, a narrower ask than the sweepers that take one investment and walk away.