Kiln Walker

Sitting still, this is a wall that contributes nothing: a 0/3 body that blocks small attackers and waits. The whole design lives in the swing. Send it to combat and the static 0 power converts to a 3, turning a defensive blank into a creature that hits for real damage exactly when it cannot help on defense. That tension is the point: it is good at one thing or the other, never both at once, and the toughness stays at 3 either way, so it neither survives combat better as an attacker nor blocks harder. The result is a creature that reads as a permanent dilemma for its controller, a body that wants to stay home and a clock that only ticks when it leaves. It belongs to the old lineage of trample-less beaters whose printed power lies about their real one (the swing-only attacker that looks harmless until the turn it commits), built as a common-rarity body for an artifact-construct shell where a cheap, durable blocker that can also pivot to offense fills a clear role. Nothing fancy in the construction; the interest is entirely in how cleanly the attack trigger inverts the card's job.