Vine Snare

A Fog with a means test. The classic combat-damage blank stops everything from the lowliest token to the biggest bomb, but this one draws a line at power 4: small attackers bounce off it harmlessly while anything genuinely large still connects. That cutoff is the whole idea. It is a Fog built to answer one specific thing, the go-wide board of cheap undersized bodies, at the cost of doing nothing against the single fat threat a plain Fog would happily turn aside. Instant speed keeps the trick alive: held up through declare-attackers, it neutralizes a crowd of small creatures, then prevents nothing the following turn. The price is part of the calculus, too. A one-mana Fog costs almost nothing to leave open; this asks for a real chunk of a turn, which narrows it from a casual insurance policy into a stop you commit to against a known matchup. The power-4 line is also precise enough to slip: the same attacker can duck under it one game and overshoot it the next once a counter or an anthem has grown the board. This is a Fog tuned for a metagame of small creatures rather than a universal pump-the-brakes button, trading the classic card's universal coverage and cheap upkeep for a targeted answer that only pays off when the board it was built for shows up.