Liquimetal Coating

The genius of this thing is that it weaponizes a category. Magic has always carried a deep bench of artifact-specific removal: Shatter, Naturalize, Abrade, the whole tradition of cards that punch a hole through artifacts and nothing else. By turning any permanent into an artifact on demand, this hands all of that targeted disruption a new universe of legal targets. A land becomes destructible by a Shatter; a stubborn enchantment or planeswalker becomes fair game for artifact destruction it was never meant to face. The card does nothing on its own, and that absence is the design: it is a key that fits no lock until you bring the lock yourself. That makes it a combo enabler in the structural sense, an artifact that multiplies the reach of whatever destruction package shares the table with it. The repeatable tap ability means each turn you can re-aim that retooled removal at a fresh threat, and because the type change reads "in addition to its other types," the target keeps everything it already was while gaining the vulnerability. It also opens quieter loops with cards that care about sacrificing artifacts, feeding fodder that was never built as a permanent of that type. None of this shows up in the rate; a two-mana artifact that taps to grant a type looks like nothing until you see what it unlocks, and what it unlocks is bounded only by how much artifact-hate your deck is willing to run.