Universal Solvent

The price tag is the whole design intent. Eight total mana and a tap to wipe any single permanent off the board is a non-rate by any practical measure: a destroy-target-permanent effect costed so deliberately high that it functions as a floor rather than a tool. The "universal" in the name is doing real work, though, and the reason this exists at all. Most cheap removal answers one permanent type and asks you to pay for it in colored pips. This answers everything (creature, land, artifact, enchantment, planeswalker) and asks for nothing but generic mana. That combination is the entire pitch: a deck with a restricted color identity, a mono-color or colorless shell that simply has no native way to touch a problem on the wrong axis, can name a hard answer without bending its manabase to do it. The sacrifice clause is the tax: one round in the chamber, so it answers exactly one threat and then it is gone, never a repeatable rock. It is not slow the way a creature is slow, either; with eight mana open it can be played and fired on the same turn, since the tap ability is unaffected by summoning sickness. The constraint is cost, not timing. It earns a slot only when a deck has painted itself into a corner, and even then it is the answer of last resort: the solvent you keep around precisely because nothing else you run dissolves the problem.