Nyx Infusion

Here is an Aura that reads its own enchanted target's type line and pays out in opposite directions: a buff if the creature happens to be an enchantment, a curse if it isn't. The split makes it a strange hybrid of Pacifism-style removal and a reward for a deck built around enchantment creatures, where the same card that shrinks an opposing blocker into nothing pumps your own. The conditional is the whole hinge: in a vacuum it's a -2/-2 shrink that can pick off small attackers or finish a damaged one, but inside a board of enchantment creatures it flips into a clean +2/+2 with no downside. That dual-purpose design is rare for removal of this kind, which usually commits to a single direction; this one asks the board state to decide which spell it is. The tension it resolves is the perennial problem of build-around payoffs that sit dead when the synergy isn't online. By baking a functional second mode into the same card, it stays castable as interaction even when your enchantment-creature plan hasn't come together, then upgrades itself when it has. It's a quietly elegant answer to the dead-card-in-the-wrong-matchup problem that plagues most tribal-style payoffs.