Is Maddening Imp legal in Standard, Modern, and Commander?

Maddening Imp is legal in: Legacy, Vintage, Commander.

Maddening Imp

Q: What type of card is Maddening Imp?

Maddening Imp is a Creature — Imp. Its oracle text reads: "Flying {T}: Non-Wall creatures the active player controls attack this turn if able. At the beginning of the next end step, destroy each of those creatures that didn't attack this turn. Activate only during an opponent's turn and only before combat."

Creature — Imp

Flying

: Non-Wall creatures the active player controls attack this turn if able. At the beginning of the next end step, destroy each of those creatures that didn't attack this turn. Activate only during an opponent's turn and only before combat.