Gravity Well

Most green answers to fliers attack the creature: a reach blocker that swats one attacker, a Plummet that kills one outright, a Hurricane that clears the whole sky and bills your own life total for it. This works on the keyword instead, and it works on all of it at once. Every flier in the game, yours and theirs, loses flying the moment it turns sideways, which collapses the entire evasion axis into a ground war for as long as the enchantment sits on the battlefield. The timing is the elegant part: declaring an attack is what strips the keyword, so a flier still blocks normally and still flies on defense; it only forfeits flight during the combat step where it would have flown over your line. That makes it a one-sided wall against aerial offense rather than a blanket flying-off switch. Green has always been the color stuck cleaning up after fliers with one-shot reach creatures and sky-clearing instants, and this is the rare permanent, repeatable version of that job: a single enchantment that taxes every aerial attack rather than answering a single attacker. The catch baked into the design is that it does nothing on an empty board and nothing against a flier that simply declines to attack into it; it punishes commitment, not existence. As a standing answer to a whole mechanical category, it is a sharper piece of hate than its plain rate suggests.