Is Acidic Dagger legal in Standard, Modern, and Commander?

Acidic Dagger is legal in: Legacy, Vintage, Commander.

Acidic Dagger

Q: What type of card is Acidic Dagger?

Acidic Dagger is an Artifact. Its oracle text reads: "{4}, {T}: Whenever target creature deals combat damage to a non-Wall creature this turn, destroy that non-Wall creature. When the targeted creature leaves the battlefield this turn, sacrifice Acidic Dagger. Activate only before blockers are declared."

Artifact

, : Whenever target creature deals combat damage to a non-Wall creature this turn, destroy that non-Wall creature. When the targeted creature leaves the battlefield this turn, sacrifice Acidic Dagger. Activate only before blockers are declared.