Sunder from Within

Flexible artifact-or-land destruction is a workhorse red effect, and the standard price for it lands around four mana on cards like Demolish, where you choose between hitting a manabase or an artifact as you cast the spell rather than committing to one at deckbuilding. This one asks the same four mana but tightens the cost to a double-red commitment, and on the destruction alone that is a worse rate than the baseline. The Arcane subtype is the reason it exists at this price. Strip that line off and you are left with a strictly clumsier version of the generic effect; keep it, and the spell gains a second life inside the spellcraft built around the subtype, where it can serve as a splice host or a link in a chain rather than living and dying as a single tempo-negative removal spell. That is the trade the design makes honestly: you pay a steeper color requirement for breadth plus a foot in a mechanical subtheme that cheaper, more freely castable destruction never touches. The card's whole identity hangs on whether you are building around Arcane at all. Outside that shell it is overcosted disruption; inside it, the removal is almost incidental, a useful body of text attached to a spell whose real job is to feed the engine that cares about its type line.