Sensory Deprivation

Power reduction is the quiet half of creature removal, and this strips it down to a single blue mana: knock three points of attack off a body and leave it standing. The defining choice is the untouched toughness. A -3/-0 does not kill anything, does not trade, and does nothing against an opponent who only wants their threat to block. What it buys is permanent, static neutering of an attacker: the enchanted creature can still chump, still wears auras, still triggers on combat, but it stops representing damage. That makes it a fundamentally defensive tool, the answer a slow blue deck reaches for when it cannot afford to spend hard removal on every aggressive two-drop. Against a 3/3 it reads as a tempo-positive pacifier; against a 1/1 it neutralizes the attacker entirely, and against anything that pumps its own power it is a speed bump. The narrow band where it shines (medium creatures whose entire value is their offense) is exactly why it never escapes the role of a budget, sorcery-paced patch rather than a serious removal staple. Its real lesson is the distinction between removing a threat and merely declawing one: the creature is still on the board, still doing everything except the one thing the spell took away.